Ep 99 Salmonella: A hard egg to crack - podcast episode cover

Ep 99 Salmonella: A hard egg to crack

Jun 21, 20221 hr 37 min
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Episode description

We’ve all been there: doubled over in pain as stomach cramps grip your guts; the panicked shuffle to the nearest bathroom; the waves of nausea and chills as you cry out loud, “oh no, what did I eat??”.  At the very least, food poisoning is a humbling experience, but at the worst, it can be absolutely deadly. In this episode, we take a deep dive into one group of pathogens commonly responsible for outbreaks of food-borne illness, the infamous Salmonella. We start first with an exploration into how and why these bacteria make you sick before turning towards the history of these pathogens, a history which includes a brief jaunt through a bizarre story involving a cult, bioterrorism, and a small Oregon town. Finally, we wrap up the episode with a look at Salmonella by the numbers today. You’ll leave this episode brimming with Salmonella knowledge, thinking twice about how well you cook your chicken or wash your veggies, and contemplating how fast you can get your hands on a food thermometer. Trust us - you’re not gonna want to miss this one!

See omnystudio.com/listener for privacy information.

Transcript

Speaker 1

My name is Beth, and I got caught up in a salmonella outbreak. I was volunteering on a tall ship, and usually in exchange volunteering, you get, you know, your meals for the weekend and the place to sleep and hang out with a crew at the festival and all of that. So we'd been working at festival for a couple of days and spent all Saturday out in the sun all day, grabbed dinner real quick, hung out with my friends, popped a couple of bars in Cleveland, you know,

evening out in the town. And the next morning, got up, did the same thing over again. Ate breakfast. I was at working in the head rig, out in the sun all morning, and again it's another hot day, but you know, nothing out of the ordinary.

Speaker 2

When we took a break.

Speaker 1

For lunch, I noticed that I was really feeling just hot and tired and dehydrated, you know. I sat down in the shade, I grabbed a water bottle, drank a bunch of water, and I just assumed I'd been out in the sun too long. The festival ended that day. I was supposed to get a ride back to my car so I could go home. The woman that was supposed to give me a ride to my car, wasn't there because you'd actually taken a couple of my crewmates to urgent care. Found out later that they were kind

of feeling the same thing. They were dehydrated, they were some of them had upset stomachs. I eventually got a ride back to my car and headed home. It's about a forty five minute drive from downtown Cleveland to where I was living at the time, and as I'm driving, all of a sudden it hits me just like stomach cramps, stomach pain. I really felt like I had to fart and it I almost made it that last couple miles. Well,

some parts can't be trusted. So I got home. I had actually pooped my pants a little bit, and so I just took off my clothes, through them in the washing machine, start a loae to wash, took a shower, put on pajamas, and went to bed. Woke up a couple times in the middle of the night again with just an urgent need to go to the bathroom, just watery diarrhea every time. Whatever was inside of my intestines was just on the fast track out and that so I spent Sunday night. That's how I spent Monday, and

as I recall, that's how I spent Tuesday too. I mean I tried to eat gland food like cheerios or instant meshed potatoes, but every time I put something in my mouth, it was just on the fast track. Clear through. I started getting messages from some of my friends who were on the ship still, and it wasn't just me. It was at first it was eight or ten of us and twenty of us, and then all of a sudden, almost forty of us were sick and not getting better.

Probably Tuesday, I stopped trying to eat. I'm like, I'll just let my entire digestive system empty out, reset itself, and we'll try food again in a day or two. That didn't fix the illness, but it did let me control my bowels well enough that I could actually go to urgent Care. So I did that. They collected a sample and sent it to the lab, and I went back home and lived on gatory. The next couple of days, Urgent Care called me back and they're like, oh, you

have salmonilla. It should resolve itself, and you know, if not, follow with your primary care doctor. And that's really all they said about it. But you know, a week into this, I still can't eat solid food. So finally, eight and a half days later, I finally got into see my primary care position and she walked into the exam room. First thing she says is you look terrible. And the next question she asked me was did you finish your antibiotics?

And I said, what an aibiotics? So it turns out that the lab results from Urgent Care had actually said you should, you know, treat this patient with this antibiotic. Urgent Care never prescribed that, So my doctor started me on the antibiotics. Four days later, all of a sudden, I can eat food again, like it's a minor miracle. But in that time and that it's about ten or eleven days between when I got sick and when I

started feeling better, I dropped about sixteen pounds. You know, that took me from being a healthy weight to being underweight. And at the same time, this is happening to all of my crewmates too, so we knew that something had gone on in the ship. That weekend when the health department actually started doing surveys and talking to all the

people who were and were not sick. We figured out that the people that were sick were not vegetarians, and they'd eaten dinner on board the ship on Saturday night. Saturday dinner was Mexican castrole, So there was a version with chicken in it, and there's a version that didn't

have chicken in it. An interview with one of the guys that helped in the galley, he says he thinks that chicken had been cooked about six days earlier, and it was put into a wood stove after dinner one night, as the stove cooled off, so the cook goes to start the fire the next morning for breakfast and finds room temperature chicken, and the he throws in the refrigerator and that Saturday night ended up in that cast role.

They also, you know, took a look around the equipment and took a lot of you know, measurements of you know, how hot the windstove got, how cold the refrigerator was, how cold the freezer was, things like that. And one of the things they discovered is there actually was not a food thermometer on board. One of the things about these ships is they have a blackwater tank and so whenever you flush a toilet on the ship, it actually doesn't flush like a toilet. You actually pumped the wastewater

into the blackwater tank. That tank gets emptied basically with a septic haller truck, so those you know, big tank trucks that have the vacuum pumps. So as soon as the ship got back to Eerie, they scheduled that truck to come in and empty the blackwater tank because so many people have been using the heads that the blackwater tank was full. So first thing on Monday morning, his first stop of the day was the ship. He pulls in hooks up to all the connections so he can

suck the poop out. When he emptied the truck the day before, he hadn't flipped the pump from pumping the blackwater out of his truck to sucking it into his truck.

So what he actually did was he pushed a bunch of air into the blackwater tank, which pushed salmonilla contaminated pool water up through the vent and all over the plays where most of the crew sleeps, and they sanitized what they could but start for a lot of people got caught that way too, so we actually had a little secondary outbreak because the back truck was set to blow, not suck. At the end of it all, I believe

there were thirty seven of us in the outbreak. It was enough, It was a large enough percentage of the crew that the ship actually had to miss some of our contracted sales and events. But it managed to take a bunch of young, healthy people and pretty much ruin an entire summer for us. Even though you started feeling better because you didn't have uncontrolled diarrhea anymore, for some of us, it was months before you could just eat

whatever you wanted without thinking about it. And then a lot of us still to this day a decade later, don't eat chicken, and several of us have sworn off gatorade too. That it's just both of those things are things that remind us of that awful week that we all spent not being able to do anything more than five feet away from a toilet, and that was enough to lead to some regulatory changes in that community. And that's my story.

Speaker 2

Oh my, oh my gosh. I mean the number of times that I went, what right are you? Are you kidding me?

Speaker 3

Like I'm sorry?

Speaker 2

What that is one of the most outrageous stories, like the old chicken. I mean, I can't. I cannot.

Speaker 4

I don't know that I'm ever going to be able to eat chicken again.

Speaker 2

Just I don't know that I'm going to be able to eat like so many things again. Well, thank you Beth so much for sharing your story, Like, oh my gosh, what an unbelievable, horrible experience.

Speaker 3

Yeah.

Speaker 2

Hi, I'm Aaron Welsh.

Speaker 3

And I'm Erin on an Updike and this.

Speaker 2

Is this podcast will kill you.

Speaker 3

Welcome. We're talking about poop today.

Speaker 1

We are.

Speaker 2

I love these days, I truly do.

Speaker 4

We talk about poop in my house like a lot lately, and so this is just like another day.

Speaker 2

I mean, I feel like it's an important thing to talk about and it people get real squeamish about it. But literally every person produces fecal waste.

Speaker 3

Yeah, everybody poops.

Speaker 2

Everyone poops.

Speaker 3

It's important. We have books about it, you know. Yeah.

Speaker 2

I guess we're not going to get that much into it.

Speaker 4

Yeah, we're not going to like Bristol stool scale it over here.

Speaker 2

Okay, adding that to my things to Google later list.

Speaker 4

We can post a picture of it anyways.

Speaker 2

Anyways, Yeah, this is gonna be an interesting episode. So this is it's not our first salmonella episode.

Speaker 3

No, it isn't. It isn't. Yeah, but the.

Speaker 2

Last time we did salmonella, we did typhoid, which is different, very different, And there's a lot of complexity in salmonella and a lot of diversity in salmonella, and it's gonna be interesting.

Speaker 3

Yeah, it definitely is.

Speaker 2

And another thing that's going to be very interesting is that in this episode we also get to learn how you determine things like the difference between the salmonella that gives you typhoid versus a slightly maybe less scary salmonella.

Speaker 4

Sarah var Yeah, we are so excited to be joined later on in this episode by Sarah Zoucha, who is a medical laboratory scientist that's going to give us a behind the scenes look at this fascinating and so important career. Like what is medical laboratory science?

Speaker 3

We've never talked about it on this.

Speaker 4

Podcast, so we'll talk about it today and we'll talk about how you choose which tests to run on various samples and what are some of the stranger samples that have shown up in the lab. But we'll get to all of those questions and more later on in the episode.

Speaker 2

Oh, I'm so excited. It's going to be so much fun.

Speaker 3

Yeah, it will be.

Speaker 2

But first, should we Is it time for quarantinees?

Speaker 3

Quarantinees? I think so? When are we drinking today?

Speaker 2

Erin, we're drinking the chicken or the egg?

Speaker 3

Lah question mark?

Speaker 2

Get it?

Speaker 3

Because they could both give you salmonella.

Speaker 2

Yeah, along with many other things. Yeah, yeah, what is in the chicken and the egg?

Speaker 4

It's a very tasty concoction without any chicken or eggs in it.

Speaker 5

Yeah.

Speaker 2

Yeah, we decided against an egg white foam for this.

Speaker 4

One, considered and discarded. But it has gin and blueberry syrup, lemon juice, some club soda, a little fizz for you. It's fantastic.

Speaker 2

And if you want to have a foam, there are many different foaming alternatives. One of them is like the water from chickpeas aqua faba. You can turn it into a like a foam, a non egg white foam topper for your cocktail.

Speaker 4

And I don't think that you can get zamonella from canned beans. Maybe just botulism.

Speaker 2

Yeah, don't quote us on any of that. I'm any of this. Moving on, moving on.

Speaker 4

We'll post the full recipe for that quarantine and our non alcoholic PLACEBA read it on our website, This podcast will kill you dot com and all of our social media channels we.

Speaker 2

Will well and on our website. I have a post it note. Check it out. You can find these sources for all of our episodes. You can find transcripts. You can find links to our bookshop dot org affiliate account, or our good reading list.

Speaker 4

I'm loving your dramatic pauses here, Aaron.

Speaker 2

You can find music by Bloodmobile. You can find links to our merch our Patreon.

Speaker 3

Can't read your own handwriting?

Speaker 2

I can't. I cannot read my own handwriting and alcohol free episodes. That'll do it?

Speaker 4

Fantastic, well done. Well shall we get into this, Aaron.

Speaker 2

Let's do it.

Speaker 3

I'm excited about it, me too. We'll take a quick break first.

Speaker 4

Like you said, Aaron, we've already it becomes somewhat familiar with the genus salmonella during our typhoid fever episode. Today, we're going to focus on all of the other serovars of salmonella and enterica, so you may or may not listeners And Aaron remember from our typhoid episode that typhoid fever is caused by a very very specific bacterium. It's Salmonella enterica subspecies enterica serovar typhee.

Speaker 2

Okay, Oh, I forgot about the subspecies part of it, yep, exactly.

Speaker 4

And I also mentioned during that episode that there's another serovar paratyphee, and there's a couple different versions of that, and together those sera VARs cause what are known as enteric fevers.

Speaker 3

Or the typhoid fevers.

Speaker 4

Okay, so let's refamiliarize ourselves with salmonella and talk about all of the rest of them, shall we.

Speaker 2

I'm excited, let's do it.

Speaker 3

Let's so.

Speaker 4

Salmonella enterica is a negative, facultatively intracellular anaerobe, which means it can live and grow both inside and outside oursells, and both with or without the presence of oxygen. So it's quite versatile, I guess. And it is present worldwide. It's absolutely everywhere. And today we're focusing on all of the non enteric fever causing seravars. These are often called nts non typhoid salmonella.

Speaker 2

Oh.

Speaker 4

So, there are over twenty five hundred, two thousand and five hundred serivars of Salmonella enterica that are in six different subspecies.

Speaker 2

Okay, so quick question, And I don't know if we covered this on typhoid, what makes a seravar a seravar?

Speaker 3

I knew that you were going to ask that, and I still don't really know.

Speaker 2

Did I ask that on sealin R have typhoid?

Speaker 4

I can't remember. I still don't fully understand because it gets into the like very confusing genetics of bacterial species and like how you define a species and how you define a subspecies. I don't know the answer, but we can at least narrow it down a little further because of those six different subspecies of Salmonella enterica, we're focusing on Salmonella enterica subspecies enterica. So all of the serovars that cause disease in humans and other animals are in

this very specific subspecies. And there are over fifteen hundred different seravars just in this subspecies alone.

Speaker 2

That's yeah, wow.

Speaker 3

Yeah.

Speaker 4

Basically, all of these different sero of VARs have differences between them obviously that lead for them to have differential host specificity.

Speaker 3

So some of these.

Speaker 4

Ser VARs infect and cause illness in a really wide range of host species, and others have a relatively narrow host range, like for example, Typhie right, which really only causes disease in humans. But luckily for what we're talking about today, most of the non typhoid subspecies, the pathogenic ones, cause pretty similar disease. They cause enterocolitis or diarrhea, so that's why they often get lumped together as the non

typhoid Salmonella group. They definitely have a range in their severity and like I said, their host specificity, so some might really only cause disease in birds or in reptiles and only rarely in humans, where others are much more common in humans, etc. And they can range in their severity, and they can also differ in their susceptibility to antibiotics

for a number of different reasons. We'll get into a little more later, but an important thing to keep in mind is that when characteristics that make a particular sera var more invasive or more likely to cause an invasive disease a more serious disease, combined with characteristics that confer antibiotic resistance, those two things combined can make for a pretty dangerous seraph ar. Yeah yeah, Okay, So let's get into how we get this, shall we? I think everybody

knows at this point. Yeah, just like typhoid, other strains of salmonella in erica, I might refer to them as just nts or salmonella.

Speaker 2

I mean, I say salmonella throughout cool I think the whole time.

Speaker 4

Yeah, these are transmitted primarily fecal oral in some capacity.

Speaker 3

Poop is where these bacteria.

Speaker 4

Come from, and poop has to somehow make it into your mouth. Salmonella is really a gut pathogen. It's found as a commensal organism in the guts of a lot of different animals. So salmonella can make its way into the soil or the water wherever there is fecal contamination.

But even if they're naturally in the gut of an animal, that doesn't mean that they should be in anywhere that they would come into contact with the food supply, right, Like, Okay, they're in the gut, they shouldn't be in the breast, they shouldn't be in the meat, they shouldn't be in the feathers, they shouldn't be anywhere else except for in the gut, right.

Speaker 3

Yeah.

Speaker 4

And also like salmonilla typhe that we talked about the other serivars of salmonilla do tend to require a relatively large infectious dose, upwards of fifty thousand bacteria in order to establish an infection. That's a lot. It is a lot, but these bacteria can grow to be in really high numbers, as we'll talk about in just a second. So when you get exposed to a pathogenic serivar of salmonilla, you eat it right on your chicken.

Speaker 3

Casserole or whatever.

Speaker 4

It travels through your stomach, through your intestines, and generally establishes an infection in the terminal ilium, which is like the last bit of your small intestine, or in your colon the large intestine. Those are the two areas that salmonella likes. Asterisk, I'm talking about human infection. I know nothing about the guts of other animals.

Speaker 2

Why does it like those areas?

Speaker 4

I think that that's just where it makes a great home in the epithelium. Okay, the epithelium is different throughout your whole rest of your gut, and your small intestine prior to that has a lot of like villi and all these little things that I don't know exactly why, But that's not where salmonella likes to make its home.

Speaker 1

Okay.

Speaker 4

Now, once it's there, they sort of grab on to that epithelium and they have a number of different virulence factors that what they do is induce a huge amount of inflammation, especially neutrophills, which are often one of our first responders, one of our first white blood cells to like rush into the scene, and they induce a ton of this. So you have tons and tons of neutrophils and other like inflammatory cells cytokines rushing to the area. And this all starts to happen. Within one to three

hours of an infection. You see massive amounts of inflammation coming in. To try and fight off these bacteria, we start making a whole bunch of proteins, We start secreting things to try and fend off these bacteria, and then within a few more hours is when the diarrhea starts.

Speaker 3

Okay, So symptoms.

Speaker 4

Start within like six to twelve hours after exposure, but after the development of this intense amount of inflammation. Right, So, typically the symptoms are a pretty acute onset of really painful crampy crampy abdominal pain, and watery diarrhea. Sometimes this diarrhea can be bloody, especially more common in kids who tend to have even more severe inflammation. And then it's also not uncommon to have a lot of nausea and vomiting because your whole colon and that last part of

your small intestine are just full of inflammation. It makes your whole guts really angry.

Speaker 2

To your body is just like, get everything out of me now, exactly.

Speaker 4

And the good news is that without any treatment whatsoever, Salmonella entercholitis salmonella related diarrhea tends to be a self limited infection that does clear up over the course of about a week, which is a really long time to be having massive diarrhea and nausea and vomiting.

Speaker 2

Right and not being able to keep anything down.

Speaker 4

Yeah, So as long as you can keep something down, as long as you can stay hydrated and avoid electrolyte imbalances from this diarrhea, then you're going to be okay.

And in general, antibiotics are actually not recommend it, Like the CDC, the World Health Organization, it's generally agreed upon that for this type of self limited diarrhea, you generally don't give antibiotics, and the only times that you do are if there are specific risk factors that make you think that this is likely to become an invasive infection or you have very high risk of it just being a really severe diarrhea, like in our first hand account,

if you're not keeping anything down, then of course something is wrong, or if you're very very young or very elderly, or immunal compromised, especially with something like HIV. And one of the reasons that it's generally recommended not to use antibiotics in the setting of diarrheal disease is that antibiotic administration in some cases can actually prolong the illness, and it can prolong the shedding of the infectious bacteria in

this stool, which I find absolutely fascinating. But now the question, of course is how often does this become a more severe infection? And by more severe, what I mean is that while in general, these Salmonella enterocolitis infections are just limited to this diarrhea, if these bacteria enter through the wall of your colon or your small intestine and make it into your bloodstream, they can cause a systemic infection, right, and that can be really severe, just like typhoid.

Speaker 2

What does that systemic infection look like.

Speaker 4

Great question, Aaron. It looks a lot like typhoid or enteric fever. It can be a really really high fever.

Speaker 3

You can see.

Speaker 4

Enlargement of the liver and the spleen as the bacteria travel there and begin to replicate within our white blood cells. It can even invade the lungs in some cases, it can cause respiratory symptoms. If these bacteria travel to the heart and infect the heart or our large arteries like our aorda, it can cause endocarditis that's inflammation of the art or end arteritis that's inflammation of our arteries.

Speaker 3

This can very quickly.

Speaker 4

Become a systemic bacteremia, so people can then go into shock. They can get very sick, very quickly. And what's interesting is that often people who end up with invasive salmonella that's not typhoid, tend to not really have as much of the diarrheal.

Speaker 2

Type symptoms at the beginning throughout their infection. Interesting, yeah, because the body is not just like shedding the as much or what.

Speaker 4

Yeah, I don't fully know, and I really tried to get a handle on, first of all, how often does this happen? And from what I can tell, it's actually way more common than I realized because the papers that I found that cited an actual number said that it could be up to five percent.

Speaker 3

Of the time.

Speaker 4

Wow, which seems really really high, right, And the mortality rate in these invasive infections can be as high as twenty to twenty five percent.

Speaker 2

So this is interesting because I think it calls into question two things in my mind. Number one is that the five percent, like, how accurate are the estimates that we have of you know, salmonella cases? Number one?

Speaker 3

Yeah.

Speaker 2

Number two, I think that this makes me ask the question about like I understand that it's sometimes not recommended to give antibiotics for salmonella, but sometimes it is like, how do you know? Like that that line seems like suddenly you cross it and this could be really bad, really fast.

Speaker 3

Yeah, And so what I don't know.

Speaker 4

The answer to what I didn't quite see in the discussion of the invasive non typhoidal salmonella infections is whether people tend to have like a Salmonella enterocolitis salmonella related diarrhea and then progress to invasive disease, or if these are kind of like two different disease processes caused by the same infection or caused by the same bacterium rather okay, and it kind of seems like it's two separate disease processes.

Speaker 2

Huh, that's very interesting.

Speaker 4

Yeah, But that's not to say that people can't become severely ill from quote unquote just diarrhea.

Speaker 3

Right.

Speaker 4

You can end up with electrolyte imbalances, you can end up with weight loss, you can end up very, very sick even from just diarrhea. So it's not like nobody should get antibiotics. It's just a matter of like risk stratifying who's more likely to either have a really hard time with it and not be able to tolerate food and just have a really hard time with the infection, and who is likely to go on to potentially have a risk for invasive disease, And.

Speaker 2

So beyond people who are immune compromised, are there other risk factors for invasive disease?

Speaker 4

Being very young, so under five, being very old so over seventy or seventy five, And interestingly, so okay, let me back up for a second. Remember how I said that salmonella causes a lot of inflammation in your gut. Yeah, so this is something that's totally different that these non typhoidal salmonellas do that typhoid doesn't do. So typhoid doesn't cause a lot of inflammation in your gut, all of the other serivars that cause infection in humans do. And so one of the things that we have seen is

that there are inherited deficiencies in certain inflammatory systems. Specifically, if anyone cares, it's like certain inner luken systems IL twelve and ILE twenty three. That people with deficiencies in these systems are at much higher risk of invasive non typhoidal salmonella infection, and they're more resistant to typhoid infections.

Speaker 2

That is fascinating.

Speaker 1

Uh huh. Yeah.

Speaker 4

The other thing is that salmonella that we're talking about today, these ser vrs seem to be specifically adapted to survive in a highly inflamed environment. So it's thought that this actually lends it a competitive advantage to establishing an infection in our guts. Right, they get into our guts, they stimulate a massive amount of inflammation that makes it harder for a lot of our normal gut flora to thrive.

Speaker 3

Then ensues massive.

Speaker 4

Diarrhea, wiping out all of their competitors, and then they can kind of flourish and take over.

Speaker 2

I really enjoy thinking about, like the ecology of microbial interactions inside I know someone, It's so interesting.

Speaker 3

Yeah, and I.

Speaker 4

Wonder too, how much could somebody's individual microbiome put them at risk or at less risk for not only having an infection, but having a severe infection or an invasive infection.

Speaker 2

Yeah, it's it's really interesting to think about. But also what about the people who get infected and then don't have any inflame animation and the salmonol just hangs out in there? Is that what's going on with carriers?

Speaker 4

So non typhotal salmonella, the kind that causes disease, we don't tend to see carriers the way in humans, at least the way that we see with typhoid. So people tend to shed for like a month after infection, like there's still salmonella there that they're pooping out, and in kids it can be as long as seven or eight weeks, which is still a fairly long time to be pooping

out salmonella. But we don't see like we do in typhoid, this carrier state of like a year or two years, or ten years, or your whole life, which I think is really interesting, and it kind of points to like this really is a pathogen.

Speaker 3

In humans and not a commensal.

Speaker 4

Yeah, huh, yeah, that that's the biology erin Wow.

Speaker 3

I mean that's kind of short.

Speaker 2

How much do we know about? I mean, and this is probably like way too much of a rabbit hole question, but how much we know about different serovars and the frequency of them, or the intensity of disease that they cause, or which ones to keep an eye out for, which ones they are associated with, which food products, all those things.

Speaker 3

It's a very good question.

Speaker 4

So I read a paper that was really diving into that kind of like this specific epimiology of all of the different seravars. It's hard because there's like fifteen hundred, which is so many.

Speaker 2

Yeah, I feel like we could spend the entire episode just like listing the names of them, and then we'd be like, okay, a two hour episode.

Speaker 3

Yeah.

Speaker 4

So there are a few that kind of stick out as being the most common worldwide and causing and therefore I guess causing the most infection, not necessarily the most severe infection, but just the most common ones. Those are enturiditis. I'm hoping I'm pronouncing that close to right Typhomirium, of which there are like Typhomyrium A and B, Like, there's multiple kind of typhomeriums.

Speaker 3

Of course, Newport.

Speaker 4

Javiana or Javiana and Infantis. Those are kind of some of the top five.

Speaker 2

There's also a Kentucky one that I saw.

Speaker 3

There is a Kentucky one. Yeah place name you know, love it.

Speaker 4

There are there are so many serovars, and in general they do have different pathogenicity. So all of the different seravars that cause disease in humans and other animals have some similar like virulence factors that tend to be clustered on what are often called these like pathogenicity islands, which I think is a hilarious term, but it basically is

just in their genome. They have these little clusters of genes that encode a number of different things like flagella and capsules and like type three transport systems that like blah blah blah help them to infect us. But there are also a number of different plasmids that they have that encode not all the other virulence factors that might make them more likely to say, be able to infect a bird or your bearded dragon or your frog and other ones that might make it easier to infect humans.

But also a lot of these plasmids are what end up conferring antibiotic resistance, which of course is a huge problem when it comes to salmonella. And I'll talk a lot more about it at the end of this episode, but that's kind of the like what happens next, because even though we don't use antibiotics to treat all human infections, you have to have antibiotics that work to be able to treat this of your infections.

Speaker 2

Yeah, yep, but how Yeah.

Speaker 4

So Aaron, can you tell me a little bit about this bug?

Speaker 2

I can. Let's take a quick break and then we'll get started on that. You know, like we've talked about we've covered salmonola before in the context of typhoid, and even though that was I feel like that was a pretty big episode and we covered a lot of ground in that there really isn't that much overlap between that history and the history of general salmonella food poisoning, or at least like in terms of what I decided to

talk about today. And I have to say that I'm really excited about it because it is I think such a fascinating look into how food preparation and can some has changed over the past one hundred years or so, and how food poisoning kind of grew as a concept during that time. But the thing that I'm most thrilled to talk about is how salmonella was involved in the first act of bioterrorism in the US.

Speaker 3

Stop it what?

Speaker 2

Yeah? I am Oh, I'm so glad. I'm so glad you don't know anything about this, because I know.

Speaker 3

Fun thing about anything, Aaron, I love it.

Speaker 2

Okay, So let's get let's get started. So in terms of evolutionary history stuff, the salmonella group that has been linked to food poisoning, like we talked about, is incredibly diverse, and the number of serovars and all of that is just it's it's I'm not going to go into the details about the origins of this or that seravar because

it's there's just too much ground to cover. But I will say that understanding the evolutionary origins of certain serovars that are associated with food poisoning and which types of food poisoning, that's incredibly important in preventing outbreaks because that knowledge can influence control strategies for instance, if one seravar is only present in the guts of diseased animals, animals that are actively showing that they are diseased, you might use a different strategy than if a seravar was a

natural commensal of the guts of like all cows or all pigs or something like that. And it can also help with identifying the source of contamination. So if you're dealing with the diseased animal only seravar and you find it in a bunch of meat, that could point towards fecal contamination in the meat processing aspect of it, which is like really bad, And I mean really in a sense finding someone else in any part of like an

animal product is bad. But I also think that like it might be dependent upon the seravar when you're like, oh, that is really alarming. How did it get all over here? Whereas there might be ones that you more commonly see.

Speaker 4

Yeah, and especially because there are ones that infect different animals. So if you have one that's more common in chickens and it's all over your beef, right, how.

Speaker 3

Did you get there?

Speaker 2

What happened here? Yeah? Yeah, Okay, So salmonella food poisoning seems kind of ubiquitous nowadays, and probably most people either know someone who has had it or has had it themselves. But has it always been this ubiquitous food poisoning presence, right,

I mean probably. It seems kind of tricky to get estimates of the timing of when salmonella started infecting people based on like molecular clock info, but people have probably been getting sick with salmonella and other food born pathogens forever. And I think that this probably ramped up somewhat with the agricultural revolution. But even though the widespread practice of keeping livestock would have increased exposure to salmonella, the big

outbreaks that we see today were still ways away. Unlike in the typhoid episode where I talked about the plague of Athens and the four hundreds BCE and the impact of typhoid on the residents of Jamestown in like the sixteen hundreds. For more general salmonella food poisoning, I'm going to jump ahead to the mid to late eighteen hundreds, so around the time germ theory was more or less

established as a thing. By this point in history, people had, of course, you know, long recognized for hundreds of years that foods could make you sick with fever or diarrhea or vomiting, but before germ theory, it seemed to generally be ascribed to chemical changes in the food as it decomposed,

or like some element of rotting food. Specifically, it was around the early eighteen eighties that people began to realize that food could look perfectly fine and unspoiled and smell fine, but could contain microbes that would make you sick if you ate it, and one or rather many, I guess of those microbes happened to be salmonella. In eighteen eighty five, researchers Daniel Salmon or Salmon I don't know, because I'm

realizing that we say salmonella, but not sam you know. Anyway, Daniel Salmon and Theobald Smith were the first to identify salmonella causing salmonellosis in pigs that were sick with hog cholera, and they thought that this microbe that they had found was responsible for hog cholera, which it wasn't, but they named it hog Colera bacillus. In nineteen hundred, it and several other microbes were reclassified and renamed salmonella in order

of salmon. But even though this taxonomy was a complete mess, the important thing was that there was now a name for these cases of food poisoning, and it also kind of provided the ability to trace its source via microbiological techniques. Pretty soon after the first identification of salmonella in those pigs in the eighteen eighties, people began finding the bacteria in many different foods, especially pork, chicken, beef, and milk, and also in people who fell ill after eating those foods.

Right like making the link between food and illness, and this period marks a huge turning point in the history of food safety, not just because salmonella had been identified, but also because it represents a shift in the way that people viewed foods that made you sick. So previously it had been specific foods themselves. Oh, this one is spoiled,

this one has undergone a chemical change. But the recognition of salmonella and other microbes as directly causing those illnesses meant that any food could be contaminated without appearing to be, and more optimistically, that those sources of contamination could mostly be eliminated through the way you handled the food. You know, you could kill the bacteria through methods of cooking or preparation,

especially heat. Food poisoning as a general term, like the term itself, came into use around this time, which I think is so interesting because it kind of represents this shift in thinking about microbes spoiling food rather than food just being spoiled on its own.

Speaker 6

Yeah.

Speaker 3

I never thought about that.

Speaker 2

Yeah, And I think this whole period also called for an infrastructure change in regulation of food safety, especially through testing, notification, and better food handling practices. But that was still a long way away, and there was a lot left to be desired, because as the global population continued to grow, people continued to leave the rural countrysides for cities. The

way that people interacted with food increasingly changed. Food was traveling larger distances, refrigeration wasn't really necessarily a thing yet, and hand hygiene was far from universally practiced. As these things were going on, the rate of food poisoning just continued to increase, Right Like, our knowledge of this group of bacteria way outpaced our ability to do anything about it.

But it wasn't really until the first few decades of the twentieth century that people began to realize the true extent of just how prevalent these pathogens were, and that's

simply because people weren't monitoring food borne illnesses. The primary salmonella related focus throughout the late eighteen hundreds and early nineteen hundreds was typhoid, and so a lot of the efforts were centered more on improving water quality and identifying human care of the disease, as we well remember from our typhoid episode, But salmonellosis kind of was just like

waiting for its moment to shine. In the first few decades of the twentieth century, salmonella seemed to be on the rise, and this was shown to be the case by the nineteen thirties or the nineteen forties, which is around the time that several countries had adopted food borne illness reporting systems. What these early reporting systems were finding

was more and more salmonella. But was there an actual increase always an important question to ask, and it seems to be somewhat debated because screening tools weren't the greatest, although they did improve the nineteen thirties and the nineteen forties, when phage typing began to be used to distinguish among salmonella seravars, and so it's possible that one big part of the apparent increase in cases was due to improvements in screening or our increased ability to trace outbreaks, or

even that more mild illnesses like food born illnesses were finally coming into view as more deadly diseases were being treated or vaccinated against. But I also feel like it's hard to chalk all of the increase up to just those things, because, like I mentioned earlier, the way people were handling food and eating food was changing, especially during World War Two and the years immediately after. So during World War two we saw a huge rise in communal

feeding spots. Large numbers of people were being fed in canteens and cafeterias, and so there was a greater potential for larger outbreaks rather than sporadic cases. And this communal feeding and rationing also led to people reheating food more often, which when done improperly, can of course lead to food poisoning. So there were more opportunities for a larger number of

people to get sick if the salmonella was there. But was salmonella itself growing in its presence or prevalence, and that also seems likely so let's consider things from the food production side, especially in the scaling up and the industrialization of many food products.

Speaker 3

That's the key.

Speaker 2

It is the key. So whereas previously people would mostly consume food that had been grown or produced in their near vicinity, like even just within a town or city, the growth of cities and a demand for more food and a greater variety of food meant that every step along the way in food production, the operation had to expand, it had to grow larger, and it had to become

more like specialized in a way. Right in the years after World War Two, especially when wartime rationing restrictions were lifted, meat consumption increased in a big way, and to keep up with that, arming expanded and intensified. Small chicken ranches or dairy farms grew into or were largely replaced by huge industrial operations, and with bigger populations of livestock, salmonella could spread more easily and infect more animals, and it

would become much more difficult to control or identify. Not to mention that around the same time post World War two is when widespread antibiotic use started to come into play, and antibiotic resistance was not far behind, and that also grew and grew and grew and grew, and to be honest, it's one of the most terrifying parts of this whole story that like, that's all I'm going to mention about it.

Speaker 4

Yeah, but listen to our antibiotic resistance episode from season three for more three.

Speaker 3

Yeah, yeah, season three.

Speaker 2

But another place where contamination came increasingly likely to occur again thinking about sort of this chain of food production

is in slaughterhouses. Yeah, So slaughtering shifted from being mostly at or near the farms where these animals were raised to happening farther away because like, oh, you needed to have more equipment to process more animals, You need to have more specific equipment, Like it was difficult to have to be a jack of all trades as a farmer and do and make a living the way you used to like it, just it became less and less feasible, and so slaughtering began to be done mostly at these

large slaughterhouses that processed many different types of meats in many different ways. So you can see how literally every step along the way of food production or preparation or consumption increased the potential for salmonella to spread, and in some cases these chain just in practices led to some increase in virulence or difficulty in treating, like we talked

about with antibiotic resistance. And also it's important to point out, as I'm sure you will later on, that salmonella was not and is not limited to just the pork or poultry or beef industries. It's everywhere. It's everywhere, and an increase in salmonella in one area frequently leads to an increase in salmonella in all areas. The mid twentieth century did see several new regulations put into place, and testing had also become more refined, but the cat was out

of the bag. Sporadic cases or outbreaks of salmonellosis had just become kind of like almost a regular thing. Wasn't

that unexpected? So in September of nineteen eighty four, when residents of a small community in or began experiencing painful stomach cramps, diarrhea, nausea, fever, fatigue after eating at several restaurants in the area, local public health officials suspected salmonella was to blame naturally, and it was samples from several people who had sought care at hospitals in the area confirmed the presence of Salmonella typhomerium, which is, like you said,

one of the most common causes of salmonilosis associated with the consumption of like contaminated animal products. So by the end of that first week of cases, thirteen of twenty eight employees at Shakey's Pizza, one of the restaurants suspected to be a source, had come down with food poisoning, and dozens of customers had called the restaurant complaining that they had gotten sick after eating there, and that wasn't

the only restaurant affected. By the time the outbreak was over at the end of September, nearly one thousand people had reported symptoms of food poisoning and seven hundred and fifty one cases of salmonella had been confirmed. That's a lot, it's a lot. It was and I think remains the largest outbreak in Oregon's history. But fortunately this samanela did seem to resolve for a lot of people pretty like

easily or pretty well, or was treatable with antibiotics. But people had missed work, they had these large medical bills, and their bodies had obviously been put through the ringer with this illness, and they were left with questions, what happened? Where did this come from?

Speaker 1

Why?

Speaker 5

Me?

Speaker 2

The big guns were called in to help the local public health department trace the source of the outbreak, and ES officers from the CDC arrived later that month and they went around interviewing hundreds of patients and their families about what they had eaten, where and when. And also they went to every restaurant in the area, testing food surfaces and employees for trace of salmonilla. They evaluated thermometers

and ovens for any inconsistencies or faults. They tested cows, milk, septic tank, city water, pond, water, produce, literally everything they could think of for salmonilla, expecting to find a common source linking all of these cases. The fact that the outbreak seemed tied to many different restaurants pointed towards a particular food item that was served at all of them, but they couldn't pinpoint it. They couldn't find it. There

was no single factor linking all of these cases. Which isn't to say that they didn't find salmonella, because they did find it in a few places, like in the coffee creamer at one restaurant, and in the blue cheese dressing in another, but those items weren't eaten by everyone who had gotten sick, and the blue She's dressing was contaminated during its preparation, not like before it got to the restaurant, which pointed towards a human source, but no

one person worked at all of the restaurants. As the investigation went on, cases dwindled and leads dried up, and the CDC was left with the unsatisfying conclusion that the outbreak was I don't know, likely caused by employees at these different restaurants, and you know a lot of them lived together or roommates, and so maybe that's what happened. And you know, that's kind of how it goes sometimes

with food poisoning outbreaks. There's no neat answer. But the people of Wasco County, Oregon would get their neat answer. They just had to wait about a year for it.

Speaker 3

Oh my god, I'm loving this.

Speaker 2

And when they got it, it was not the answer that they were expecting, although at least a few people had had their suspicions all along. The reason that the food poisoning investigation had such a hard time linking all the cases to one food or one person was because it was actually many foods poisoned by many people, people belonging to the Rajni SI some say movement, some say cult. So there was one common source for the salmonella cases all along, but the CDC investigators did not expect it

to be intentional poisoning by a cult. Okay, so what why?

Speaker 1

What?

Speaker 2

What's happening?

Speaker 3

What? I'm sorry, this is a cult podcast now.

Speaker 1

I know.

Speaker 2

I know. Let's get into it, okay, And this is why. So this is why I asked you whether you had seen Wild Wild Country, that documentary series. Oh no, heaven, it's so interesting. And everyone who's listening and hasn't seen it yet go check it out. And everyone who has already seen it, and I suspect a great number of you out there have already seen it, watch it again or you know, like this is just a refresher, So I don't know, I hope you enjoy it.

Speaker 3

I'm excited.

Speaker 2

Okay, So to get into the what and the why and the how of this massive salmonella poisoning, which this is the like I said, the first bioterrorism attack in the US. We have to go back to around nineteen eighty one. That year, a group of people from this religious movement, including its founder, Bagwan Shri Rajdish, moved to Wasco County, Oregon, which is about ninety or so miles east of Portland, to a sixty four thousand acre ranch

they had purchased. The group had left Puna, India for Oregon after a lot of political pressure and reports suggesting that the cult was basically a money making scheme which exploited not only it's wealthy members but also did other illegal things to make money. I don't know if it's been confirmed or not, but they wanted out and they wanted to establish.

Speaker 3

A utopia elsewhere.

Speaker 2

Ma Anan Sheila, the personal secretary and right hand woman of the cult's leader, Rajniche, was charged with finding a place where they could build this utopia where the followers, known as Sanyasen's or Rajni She's could freely practice Rajnish's teachings, which involved a lot of love, beauty, guiltless sex, and capitalism. There was a store where you could like become more

enlightened by spending money. It's cool, kind of genius and so this is how she decided on this ranch, right, the sixty four thousand acres, plenty of space to grow, beautiful land, all of that stuff. Their arrival was not really met with open arms by the people living in Wassco County, especially those living in the small town of Antelope. And when I say small, I mean like population a few dozen small that was located really near the ranch.

And tensions between the townspeople of Antelope and the ranch continued to mount as the Rajniches built up their community to essentially be a mini city, complete with dozens of modular buildings and mobile homes and a frames, a two point two acre meeting hall, a one hundred and sixty room hotel, a two block long shopping mall, a casino and a disco, a medical lab, a dam, and a lake water sewage and transportation systems, an airstrip for the

five private jet planes and helicopter owned by the cult New Roads. I mean, you get the picture. It was they built a whole city, a whole city. It was a massive undertakings. It's yeah. And this happened within a very short time frame, like when just a matter of a couple of years which was terrifying for the people of Antelope, who started to look for ways to kick these people out of the town or ideally out of

the country. And when the legal way of doing things didn't look like it was going to work to get them gone, some open threats began to be made with a lot of gun carrying around town. It was Yeah, and the Reshine She's they met fire with fire. They were began to stockpile weapons make threats to the town people, and they also used the legal roots available to them.

They ran for town council. Oh okay, and they won handedly. Yeah, because the Ragine She's greatly outnumbered the other residents of Antelope. This meant that the cult now controlled everything in the town, like everything, the roads, the water, the police force. They renamed the town Rajni she And this of course further escalated things because then residents of Wasco County and Antelope ramped up their fight to get rid of the cult.

On both sides, there was violence, there was threats of violence. It's a story of like constantly mounting tensions where cause and effect is really difficult or almost impossible to disentangle. Yeah, and a big reason for this constantly mounting tension was at least in terms of the cult ma Anan Sheila.

So Sheila, who was spokesperson for the cult and effectively its leader during Ragni's four year vow of public silence, she was determined to win, to just gain more power, and that's what she viewed as her life's mission, this movement and making sure that this movement had whatever it needed to grow and expand, and any threat to the movement was a threat to her directly. So she announced that she wasn't going to stop at taking over Antelope. She had set her sites. Next on Wasco County, the

entire county, after that, Oregon, and then the world. The only problem was that the cult members, who numbered like two to three thousand estimates vary, they didn't have the numbers to outvote. The other Wasco County residents, which is around twenty thousand at this time. Okay, but luckily Sheila

had a strategy. She coordinated the buzzing in of thousands of people who were experiencing homelessness into the ranch to then get them to register to vote so that in the next Wasco County election in the fall of nineteen eighty four, they would have stronger representation, but that didn't

work out as planned, again with legal battles. At this point, though, Sheila's position was getting to be a bit tenuous within the cult and she felt increasingly threatened and desperate to not lose her status as like the de facto cult leader. She had to win this. Registering thousands of recently arrived people to try to win an election didn't seem to be working out, but that's okay. Shila had another.

Speaker 3

Plan, oh no.

Speaker 2

In the spring of nineteen eighty four, Sheila and one of her top lieutenants, ma anand Pooja, who was a nurse in charge of the Rajnish Medical Corporation, they had a brainstorming session about ways they could, you know, ensure the that they won the election. One of the ideas floated was poisoning people to make them too sick to vote, but make them sick with what that was the question?

Sila and Poja began reading books like I Kid You Not, How to Kill Volumes one through four stop and The Handbook of Poisons, which, like, I'm sure that like based on what we do for this podcast, our Google search history is also quite bizarre. Yeah, but still, but still. And they also visited a local urologist to ask which poisons and bacteria would be difficult to trace but deadly, And they were like, oh, well, we're worried about people poisoning the cults, so we want to know what we

should keep an eye out for. And he was like salmonella, Like, well, kind of easy to trace, but okay. It seems like they were more concerned about like the logistics of it, and like, how do we best do this. Sheila had tried to coordinate the assassinations of political enemies of the cult, and she had also poisoned people who had wronged her

within a cult. Naturally, Pooja was apparently known by some in a cult as Nurse Mengly because of her obsession with using poisons and pathogens as a weapon, with one report of her trying to weaponize HIV. So, you know, it's I'm sorry, what I know, it's horrifying, And there's so much more to the story that's like this is

just scratching the surface. It's kind of unbelievable. So at the ranch there grew to be increasing conflict between the Rashni She's and these people that had been busted in, and so Pooja's and Sheila's solution was to tranquilize the people the new arrivals, either with sneak injections or by putting it in the beer that they were given every day, but for their sicken the public to prevent voting scheme.

They also toyed with the idea of hepatitis viruses, typhoid and putting beavers for giardia, or just dead rats and mice into the public water system, just dropping it in there to make everyone sick. But salmonella seemed the most promising, not to mention accessible because where do you get salmonella?

Speaker 1

Right?

Speaker 2

You order it?

Speaker 3

You can order it.

Speaker 2

I don't know if regulations have changed, but because back then they had a medical corporation and a lab, all they had to do was order samples from companies. Yeah, salmonella, typhomiriam wasn't the only one they ordered. They also got positive agents for typhoid, gonorrhea, tularimia, ooh, shigella, and others.

Speaker 1

Yeah.

Speaker 4

I mean, you're supposed to have a medical lab that is biosafety licensed of a certain level to deal with certain pathogens, and those are supposed to be inspected. However, often to maintain their status, they're supposed to be checks and balances in place here.

Speaker 2

Well, but I think the thing is they had been inspected by the public health officials. Their operation, their medical lab operation was big, like they had jit equipment and everything. So it which makes it all the more scary, I think, I know. But to make sure that salmonella typhemurriam was the one they had to test it out. Of course, the perfect opportunity presented itself with a planned visit in late August nineteen eighty four by Judge William Holtse wasco

County executive and Raymond Matthew Wasco County commissioner. They got a flat tire during their inspection of the ranch, and while changing the tire, they were offered some cups of water which they drank.

Speaker 3

Oh my goodness.

Speaker 2

Within about eight hours they were both violently ill and Holse nearly died. Like he went to the hospital and was like it was touch and go wow. And the cause salmonella salmonaa. So now we arrive at the big moment. The poisoning of Holse and Matthew showed that those samples could make people sick, but what it on a big scale For that, a bunch of members from the cult

dressed up in disguise. They put on wigs, and they changed out their bright red clothes and robes for more neutral toned outfits, and they went around to restaurants and grocery stores in the dolls, mostly sprinkling salmonella on salad bars, in coffee creamers, in dressings, over produced departments and so on, like everywhere. They just literally seeded everything with salmonella.

Speaker 4

Okay, how did it come to light Aaron?

Speaker 2

Okay, So at the time, like I said, the CDC concluded that, well, we don't really know exactly what happened.

What we suspect it was this person. There were people who did suspect that it was the cult, it was the Rajniches that were behind it, But there was no apparent evidence at the time linking the rush Niche She's to the outbreak the poisoning, which that was just sort of like a dry run, I guess, because this was in September and the actual voting happened later on, and so when it came time to the actual election, there was, as far as I'm aware of, no like salmonella poisoning,

and the Rajnich candidates in this election lost by a landslide. There was a record ninety three percent voter turnout. Wow, that's really high. Sheila's position, I think, with this loss, continued to slip and her paranoia grew. And on September thirteenth, nineteen eighty five, which is about a year after that Salmonela attack began, Sheila and a few others fled to Europe. A few days later, raj Niche broke his four year vow of public silence. He came out on stage and

was like, I denounced Sheila and her allies. They betrayed my faith. They had done they were responsible for all these criminal things. They're horrible people. They're no longer in the light, et cetera. You know, she attempted murder of followers who challenged her authority. She mismanaged my money and left this commune fifty five million dollars in debt, and so I have to sell my ninety rolls royces. She

tried to poison my doctor and dentist. She did incredibly intensive wiretapping, experimented with different lethal poisons on mice to try to find ones that were untraceable and had coordinated this salmonella attack. And so in the midst of all of this denouncing of Sheila, Rajnische was like, I demand a government investigation. This is on you now, you need

to investigate what's going what happened. And the investigation found glass vials containing salmonella bactrol discs that had been ordered from VWR Scientific and sure enough that salmonella was the same as the one that had made those hundreds of people sick in the Dallas and Rajishi, of course denied knowing any of it. He was like, I knew nothing. So was Shila just escapegoat for all of this? I mean, she clearly was responsible for like a lot, and she

clearly was completely without morals. But yeah, so how does the story end. The story ends with a few of these key players getting some jail time about four years and had to pay some fines. So Sheila, if you are curious, now runs a couple of care homes in Switzerland for seniors and people with degenerative disorders.

Speaker 4

Your face, I no, oh, no, m hm, fascinating, Aaron, Aaron.

Speaker 2

Nah, I know, h it's so interesting because I was trying to figure out, like, what is the legacy of this bioterrorism attack. This was the first time when we were doing this episode that I had read about it, and I was like, what on earth, There's so much more to this story than I had any idea. This seems like it would have been huge news, and of course it was in Oregon, but from what I read, it doesn't seem like it got a ton of national attention.

And I think that part of the reason for that is because public health officials were like, oh my gosh, this was so easy for them to do. We don't want people to know that this is possible. We don't want any copycats. This is disturbing. And so, as far as I could tell, it didn't really immediately result in any changes to regulations about who could order germs or for what purpose. I imagine I hope that that has

changed somewhat by this point. Interesting in any case, the nineteen eighty four Wasco County salmonella attack was not the last time that salmonella made headlines. There have been many unintentional outbreaks since, including a huge one in Chicago from contamination at a milk processing plant, and it led to sixteen thousand confirmed cases.

Speaker 3

Ooh, sixteen thousand confirmed.

Speaker 2

That's what it said in the new In a news report I read, yeah, oh my god, that's going to be a lot more than that actual cases. Uh huh oh boy.

Speaker 1

Yeah.

Speaker 2

And reports in the late eighties revealed the incredible extent to which salmonella is present on eggs, which was also I think the first time that food hygiene as it related to salmonella gained more widespread awareness. But I'm really curious, Aaron, what has happened in the years since. Oh, I know, intibiotic resistance is an issue, and reporting and tracing outbreaks is so problematic. Can you bring me up to speed? How many people get sick? What's the biggest problems all that stuff?

Speaker 4

I can't wait to Let's take a break first, So I thought for this one, I'd start like as broad as possible and then dig down to more narrow All right, Okay, that's my sure. So globally, if we just look at food borne illness in general, the World Health Organization estimates over six hundred million infections and four hundred twenty thousand deaths associated with food born illness specifically, If we look

just at the diarrheal food born infections. Those cause an estimated two hundred and thirty thousand deaths worldwide, so over half. And salmonella is one of these principal agents that cause

death among those food born diarrheal illnesses. So it's estimated if we now just look more specifically at salmonella, that salmonella enteritis itself in twenty seventeen is estimated to have caused over ninety five million infections worldwide, and there's a really wide margin of error on that estimate, of course, and over fifty thousand deaths. Again wide margin of error.

If we now get even more specific and turn to invasive disease, so invasive salmonella, not typhoid salmonilla, it's estimated that there were in twenty seventeen over five hundred and thirty five thousand cases of invasive non typhoidal salmonella, with the highest incidents in Sub Saharan Africa, and they estimated over thirty four cases per one hundred thousand happened in children under age five, so a huge burden in children, and they are of course some of the highest risk

for severe illness and invasive disease and this paper also estimated over seventy seven thousand deaths in twenty seventeen just from invasive salmonilla. So that's separate from the salmonella enteritis.

Speaker 3

Oh wow, I know.

Speaker 4

Yeah, the all age case fatality rate for invasive salmonella was fourteen and a half percent on average, fourteen percent death toll from invasive salmonella.

Speaker 3

That is, I had no.

Speaker 4

Idea how severe an invasive salmonella infection.

Speaker 2

And so when you get an invasive salmonella infection, is it just that antibiotics don't always get there in time, or is it antibiotic resistant infections? Like what's contributing to that high death toll?

Speaker 4

Yeah, it's a good question. I think it's a lot of things. I think it's probably a combination.

Speaker 3

Of all of that.

Speaker 4

It's also that so the case fatality rate is even higher if you look at just the elderly, or look at just those under age five, or just those living with HIV, So that's even just the average. But I think it's a lot of things. I think it's how overwhelming the infection can be, maybe by the time you identify it.

Speaker 3

I think it's that a.

Speaker 4

Lot of these are happening in areas that have a lack of access to good medical care, or to rapid medical care with identification and quick treatment and that sort of thing. So I think it's a lot of factors that play into it. In the US alone, the CDC estimates that there are over one point three five million cases of salmonellosis every year, over twenty six thousand hospitalizations and four hundred twenty deaths in the US. And now

here's where it gets even scarier. And this data I really only have for the US, but this isn't specific to the US, but this data is from the US. Of those one point three five million cases, it's estimated that over two hundred thousand of them are due to antibiotic resistance salmonella. Wow, including an estimated twenty thousand, twenty thousand, at least cases a year that are resistant to three or more of the essential antibiotics that we would use

to treat salmonella. Antibiotic resistance it's a really big problem, obviously, when it comes to so many infections, not just salmonella, but in salmonella. I think part of the reason that it's a particular problem is because of the way that antibiotic resistance can develop in our food system and then

spread through that food system. Yeah, right, So, because salmonella can be found in so many guts of so many animals, especially domestic animals that we use for food, it can then, like you were saying, aaron, enter our food system from a number of different ways, from the processing to the water supply. It can end up on the boots of a farmer and then be transferred between locations. It can end up in the soil. It can be carried by

rodents or even insects. Potentially, it can persist on shared equipment like you mentioned, It can be in these tanks where they're cleaning things that just then get filled with salmonella. It can be everywhere. It has a lot of points of entry into our food system. Right, that's just salmonilla. Now, Antibiotic resistance genes are present not just in bacteria of pathogen potential, but antibiotic resistance genes are present in a

lot of environmental microorganisms. So there's what's often called like an environmental resistome that exists, and these genes can then also make their way into bacteria of pathogen potential. It doesn't have to be that these salmonella making their way into our food system have to evolve these resistance genes denovo. A lot of the times these genes already exist and in many cases are present on plasmids or if let's say other like lactic acid bacteria in the soil like

break open. Now, these genes are in the environment, so bacteria like salmonella can then come into contact and pick them up via conjugation or transformation. See our antibiotic resistance

episode for more. But and that too is one of the reasons why, like the widespread use of antibiotics, especially in our farm system and our domestic animal like animal for meat production and things, is so concerning and such a big part of the problem that contributes to antibiotic resistance, right, because you're selecting for these resistance genes not just in the pathogens, but in the environmental bacteria as a whole.

Speaker 2

It is nightmarish, It really is.

Speaker 3

It is.

Speaker 4

Yeah, speaking of nightmarish.

Speaker 2

Great, Yeah, love that segue.

Speaker 3

Right, that's a good one. Thanks for handing it to me.

Speaker 4

I want to give a shout out to a very great and thorough article that Aaron you sent me over. This article was published in pro Publica. It dives very deeply into an outbreak that perhaps is still evolving, perhaps has waned, it's hard to say, but an outbreak of Salmonella a sarahvar called infantis, which I mentioned at the top,

that started in twenty eighteen. This is a particularly multi drug resistant and particularly infectious and tends to cause relatively severe disease sarah var that really ran rampant and was found at extremely high prevalence in meat and poultry samples. And throughout this outbreak, according to the article, the CDC estimated that for every confirmed case of salmonella, an additional thirty are never reported, So this outbreak likely had infected nearly three thousand people.

Speaker 3

I had never heard of it. No, Yeah, this was.

Speaker 4

Like twenty eighteen, twenty nineteen, Like this just happened. And this article does a really great job of kind of highlighting some of the major flaws. And this is US specific, and they kind of compare to the way the regulatory system works in the US versus Canada and Europe and

other countries. But we have in the US some pretty massive holes in our how our regulatory system works in terms of what the CDC can do and require and investigate and what their investigations can then produce as like a recommendation or product versus the FDA versus the USDA who oversees meat and poultry and that is separate from the FDA that does all of the rest of the food right and essentially, just like this system, which probably

comes as no surprise to anyone who's listened to this podcast, is not designed to protect the consumer. No, it's designed to protect the industry. You might hear about salmonella in your bag of spinach every once in a while, you might hear about it every once in a while in

chicken from this one farm. But the problem is so much bigger than that, and to really get a handle on it, we have to truly in this country revamp the way that our food system works and the power that regulatory government bodies actually have to regulate that industry, which essentially doesn't exist right now. Salmonella is pretty easy to kill. It's not like some of the bacteria that we've talked about that have like very environmentally hardy spores

or anything. So cooking your food properly does kill the bacteria, and it does have a really high infectious dose so that's also good.

Speaker 3

Yeah.

Speaker 4

It is also though, really easy to contaminate other parts of the kitchen, so I think like, yeah, the knives, the cutting boards, the counter, your hands. Everything has to be really well cleaned, including things that you aren't going to cook like salad, greens, or fruits. These things need to be washed, and that can really be a challenge sometimes it can.

Speaker 2

It really can.

Speaker 3

One of the.

Speaker 4

Biggest tools that we have to use in understanding the extent to which salmonella poses a public health problem is of course through testing, but not just testing up of environmental samples or of meat products or produce, but also testing of humans when we get sick. Because while a lot of salmonella cases are never reported because the person who got sick maybe didn't get sick enough to actually go to the hospital or clinic, but there are a lot of people who do.

Speaker 3

So if, for example, you.

Speaker 4

Get quite sick, you have really bad stomach cramps, you absolutely can't stop pooping, and you decide to go to the hospital or a doctor's office. Once you're there, what's very likely going to happen is that you might get asked to provide a sample of said poop or stool to figure out what the cause is of your symptoms.

But the question is how exactly does all that information come to light, Like where does that stool sample go, who is the person who's having to sort through it and test it, and what else are.

Speaker 3

They working with.

Speaker 4

We are really happy to have the help of medical laboratory scientist and TPWKY listener Sarah Zoucha to help us answer some of these questions and to shine a light on a sometimes very overlooked but crucial field in healthcare, medical laboratory science. Will let Sarah introduce herself right after this break.

Speaker 5

Hi, I'm Sarah Zoucha. I'm a medical laboratory scientist. I have been working in the field for about twelve years. I'm ASCP certified as a generalist, which means I can work in all areas of the clinical laboratory, including blood bank, hematology, chemistry, and microbiology, which is my primary focus and where I have been working for the past ten or so years.

Speaker 2

Awesome, thank you so much for being here. Can you walk me through what happens in food borne illness testing in general, like what's the process from the doctor's office to test results and what are the other common pathogens that you look for.

Speaker 5

In any kind of laboratory testing, there are three phases. There's the pre analytic phase, which is what happens with the specimen before it gets to the lab, the analytic phase, which would be the actual laboratory testing, and then the post analytical phase. So starting in the pre analytic phase, that's you know, when the patient goes to the doctor, they're not feeling well well, and the doctor will be asking about patient symptoms when they began, what their symptoms are.

Specifically if they're suspecting a food born illness, of course, where did they eat, what did they eat, any travel history, things like that. The next thing they will do is they'll collect the specimen from the patient, so the doctor will give the patient everything that they need to do that and in the case of food born testing, they're

going to need a stool sample. So the analytical phase of testing is when the specimen is actually received into the labs, So the specimen is processed for testing, and there's a couple of different ways that this can be done. Right now, a lot of labs are moving to a more rapid kind of testing versus traditional culture. In traditional culture, you have to weigh twenty four hours for the bacteria to grow before you can really do anything with it.

With the new molecular test, it's a panel that will test for the most likely suspects in food borne illness, so it will give you a preliminary result right away, so the doctor kind of has a heads up the day that the specimen is received into the lab, and these panels typically test for Salmonella, Shigella E. Coli, Arimonas, Plisiomonis,

Vibrio campilobacter, and your sinea Ento kalitica. You can also get expanded panels for other things like parasites and certain viruses that may cause gastrointestinal discomfort, depending upon you know

the hospital and what they determine needs are. So once this molecular panel is run, if there is something that is identified in this panel, what will then happen is that specimen is cultured out and grown in traditional bacterial culture for confirmation, and then this is done by different biochemical testing and other commercial laboratory instrumentation that will confirm

the ID. Once this bacteria is identified, then it is typically sent out to the local Department of Health or other state reporting agencies so they can do kind of their follow investigation, and then this kind of leads us into the last phase, which is post analytical, where the results are reported out to the patient's chart, called to the clinician if it's considered a critical value, and then any contact tracing or patient follow up is performed.

Speaker 2

So with cases of food poisoning, you have your usual suspects that you're looking for, But what if you don't know exactly what you might be looking for in a suspected infection, Like where do you start your search in that case?

Speaker 5

Actually, how it works is we're supposed to be totally blind when we have a sample come into the lab. We're not supposed to really know too much about the patient in their history because that can bias the results. So when the specimen comes into the lab, all we know is that the doctor wants this kind of test. So like in the case of suspected food borne illness,

they're just going to send a stool culture. So we would just set up the testing and basically we have a list of what we're looking for and we're ruling everything out. If the culture is negative, we're gonna send out those results. But if the doctor does suspect that there is still something going on, then that's when they would order more testing. So like they would know, Okay, this patient is exhibiting GI symptoms. It's not bacterial. Well, maybe it's viral, so let me order a viral panel.

You know. If that's negative, then they'll be like, all right, parasitic, let me order an OVA and parasite panel.

Speaker 2

You know.

Speaker 5

So it's really up to the doctor to kind of make that determination. We in the lab aren't really authorized to order testing. Is that constitutes treatment and diagnosis, which is out of our skull. The only time we're able to order extra testing to rule things out is if it's something that's predetermined by the medical director and the clinician team, where a test would automatically reflux.

Speaker 2

As a medical laboratory scientist or a technician, what are some of the places you can work and what does the current job market look like for these careers?

Speaker 5

So the current job market is super excellent right now, there is a severe shortage. I went on the Bureau of Labor Statistics to find out how short we actually are. So, according to the Bureau of Labor Statistics, job growth between twenty twenty and twenty thirty is eleven percent faster than the national average for most other jobs. What's going on right now? If you graduate, wait from college, you can get a job anywhere, like anywhere you want, any city,

any hospital. I mean, everybody is hiring. So some of the places that people normally work, hospital labs are the most common, but also there's reference labs like lab core quest a RUP. A lot of times doctors' offices or urgent cares will employ an MLS to run their small in house laboratory point of care, which point of care is kind of maintaining the devices that the nurses would

use at a patient's bedside, like glucometers. Public health labs, pharmaceutical companies, medical device companies, in research are other areas that do employed clinical laboratory or medical laboratory scientists. However, I feel like those are little bit less popular and also harder to get a job in those industries.

Speaker 2

What is the most unusual sample you've ever worked with?

Speaker 5

The most unusual sample I've ever worked with probably any like amputated body part. When you're testing something like that, you're generally it's a tissue culture. Like let's say somebody has gain green, and so you know, you're trying to figure out the cause of the infection. So what's really supposed to happen. The doctor's supposed to cut off a piece of the tissue and deliver it to the lab

that way. But there's been times where it's remember one time we got something that was like a tupperware container and I open it up and it's like half a foot and you know, we've gotten fingers, we've gotten tips of penises. Yeah, so those would be yeah, some of probably like my more memorable ones where I'm just like, did they really just do that?

Speaker 2

My goodness, I really cannot get over it.

Speaker 4

That is amazing, amazing and hilarious. Thank you so much, Sarah for taking the time to chat.

Speaker 2

Yes, thank you. Well, uh, should we do sources?

Speaker 3

Sources? Definitely?

Speaker 2

I will shout out a few. There were a couple of papers by Hardy, one from nineteen ninety nine, one from two thousand and three that kind of looked at this bigger picture of salmonella and the way that like food production changed, and of course the documentary Wild Wild Country.

Speaker 4

I had a number of papers if you want to know more about the differences in the epidemiology of.

Speaker 3

The zero of VARs.

Speaker 4

There was a paper in Applied in Environmental Microbiology from twenty nineteen that went into a lot of detail on it. I really enjoyed a paper from Frontiers in Microbiology twenty fourteen that was like comparing and contrasting typhoidal and non typhoidal Salmonella sero VARs.

Speaker 3

There was a.

Speaker 4

Bunch of really good ones and I will also link to that pro public article if you want to read more about that outbreak that happened in the US recently.

Speaker 2

Thank you again so much, Beth for sharing your story. We really appreciate it.

Speaker 3

Thank you.

Speaker 4

Thank you also to Bloodmobile for providing the music for this episode and all of our episode.

Speaker 2

And thank you to you listeners. We hope that you enjoyed this poopy episode.

Speaker 6

Whoope episode Yeah, it wasn't actually that poopy, It actually wasn't yea. And a special thank you to our patrons.

Speaker 3

We love you, We love you.

Speaker 2

Okay, Well until next week, my gosh, please wash your hands and your fruits and vegetables and us a thermometer.

Speaker 4

And your knives and your cutting boards and your kitchen counters and your what do you do about sponges you, filthy animals.

Speaker 1

E

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