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Trichinosis in Free-Range Pigs: Cause for Concern, or Sloppy Editing and Writing?

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Photograph from The Pug Father on Flickr

As someone who has fallen head over heels for designer pig, I was initially dismayed to read in the New York Times on Friday that trichinosis, which has basically been wiped out in industrially raised pigs, had been found in two designer pigs—and that a higher percentage of free-roaming pigs had salmonella and toxoplasma.

It was the mention of trichinosis that got to me. I began to worry that this news makes a serious liar out of me. For years I've been telling people not to worry about ordering pork chops medium-rare because there hadn't been a case of trichinosis reported in the U.S. in many years.

Then I reread the piece and really started thinking about it, looked around online, and finally decided to talk to a pig farmer about it, something I don't think the writer, James McWilliams, did (and, regrettably, the Times editors didn't tell him to do).

The conclusion: It was an irresponsibly edited and unnecessarily alarmist story, at least when it comes to trichinosis.

Serious eaters don't have much to worry about in contracting trichinosis—if they take a few basic precautions.

My research yielded the following: The National Pork Board's website says the trichinosis bacteria, called trichinellis, is killed when the meat reaches an internal temperature of 137 degrees Fahrenheit [PDF]. The usually cautious USDA recommends you cook pork until it's 160 degrees.

According to the Centers for Disease Control and Prevention, only five Americans were diagnosed with the disease in 2004, and most of them probably got it from eating wild game, most likely bear.

Why didn't the Times require McWilliams to do more homework after he turned in the piece?

Flying Pigs Farm's Jennifer Small was, as expected, chagrined to say the least.

"I've been thinking about this all day," she said. "It's true that you can get trichinosis from pork, and the study proves that trichinosis still exists, but according to the Centers for Disease Control, trichinosis is killed at 137 degrees Fahrenheit, which I believe is beyond rare. I cook our pork to 145 and then let it rest, and it's not all that rare.

"Every time you put something in your mouth, you're making a choice. Confined pigs need huge doses of antibiotics, more than humans are ever given, and the diseases we can get from ingesting too much of those antibiotics are much scarier than trichinosis."

Serious eaters, I am going to continue buying and eating pork that comes from responsibly and humanely raised pigs like the meat I get at the Union Square Greenmarket from Flying Pigs Farm. The Times should have required a little more information and reporting from McWilliams. His piece has caused much unnecessary anxiety on the part of pork-lovers and responsible pig farmers, and that's a shame.

33 Comments:

Besides sloppy reporting--there is also tendency to write a story to fit a preconceived conclusion. Nothing new at the "paper of record."

Also from what I've read, it looks like freezing pork for more than three weeks will also kill any parasites. Most of the local meats we buy at the farmers markets are frozen, I wonder how long they are usually frozen for.

This past summer one of our local county health inspectors and I were discussing new menu rules Michigan wanted to implement regarding the printed warnings regarding raw and undercooked food. I mentioned off-handedly about the medium-rare pork listed in the menu I design for a local restaurant. She about had a conniption about it, spouting the 160 degree F rule. It was kinda funny when I asked how many complaints and illness reports they'd gotten because of it, which of course was zero. she had no defense, except that of, "Well that's the rule". Nah, that's a lack of real knowledge and understanding.

I'm a black and blue guy when it comes to beef and lamb, and even duck breasts I prefer on the rare side, but chicken, turkey and pork, I prefer cooked to hell. Not for any health concerns, I just think those meats have better texture and flavor after they've cooked all the way.

Trichinella spiralis, the causative agent of the disease trichinosis, is a round worm, not a bacteria. Maybe this is a small distinction to some.

the "assembly line" mentality of cooking pork to 160 degrees, or in other words, the dulling of the taste buds and brain cells of america -- yet another way big brother looms over our lifestyles.

brought to you by the samonella peanutty- beauracrazy!
usually asleep at the wheel, but wakes up with some intense shaking when really necessary.

of course they need to protect the public... i'm just making a joke.

Thanks Ed. I didn't want to be afraid to eat my favorite meat!

I'd rather eat well-done free-range pork than get a MRSA infection.

Considering that this article is also full of sloppy writing and clearly not edited at all, I think the title is going a bit overboard. First of all we're not talking about a bacteria here, it's a worm, a parasitic worm that likes to live in your brain. Sounds good, huh? Second you're quoting a pig farmer for advice----um is she a microbiologist or an MD or someone else with qualifications to address this. All she does is quote the CDC which is a great source but anyone can google that same info. The problem is that even knowing the appropriate cooking temperatures people still get sick. Hamburger is perfectly safe if cooked to the appropriate temperature even it was contaminated with E coli and yet people still get sick all the time. What happens if you didn't really measure the thickest part of the meat or your thermometer is off by a few degrees. Thats why the USDA recommends 170. Is it really worth getting an untreatable worm that's going to lodge itself in your brain just to have a moister cut of pork?

@LPC...I talked to one of the state health inspectors here in Florida about eating pork cooked to medium.She loves her pork chops cooked this way,but wouldn't DARE eat a hamburger unless it was cooked well done. Go figure !

Not only all that, but the study referenced was "sponsored science" paid for by the National Pork Board.

see: http://food.theatlantic.com/nutrition/sponsored-science-strikes-again.php

Hmmm. I wonder if they have an agenda?

First off, this isn't an article, but an opinion piece, much like the post here on SE is an opinion piece. That aside, I'm not sure what's so alarmist about this. If the cited study was well-designed, and shows significantly greater incidence of nasties (that's the technical term) in free-range pork, then it far outweighs anything a pig farmer might have to say about the subject. If the study was not well-designed, or the data not well-interpreted, then the findings are to be rejected. If, however, the results are valid, then this is something that should be taken seriously, even here on Serious Eats.

It's clear to anyone who reads the column fairly that the point is not one of how well pork should be cooked (that's a pretty frivolous interpretation), but of the dangers in raising free-range animals for food. Those dangers are supported by a study, and the study is cited. It seems to me that if you want to argue against it, you need to look at the study, not the writing style.

Let us not forget that the author of the op-ed piece also has a book to sell. Nothing like a controversy to keep one's name in the forefront . Or in the front of Barnes & Noble's window. I agree with Ed that the piece was irresponsible and had more than a tinge of hysteria attached to it. I was also flummoxed by the use of the term 'free-range pig". I am used to that designation to describe how chickens, etc are rasied but I have never heard the term in reference to pigs. Heritage yes, free range no. I also agree with the poster who stated that commodity pork is full of antibiotics that probably do us more harm than we know. I'll take a chop from Flying Pigs over one from Stop N Shop any day and take my chances. And as for the New York Times, well, aren't they the paper that promoted the war in Iraq with fabricated and/or erroneus information?

@sally599 Note: This particular pig farmer and her pig farming husband both happen to have masters degrees in public health

mphuges: The study was sponsored by The National Pork Board and measured the presence of antibodies, not actual toxins.

More detailed analyses:
http://www.livablefutureblog.com/2009/04/smoked-“bacon”-and-mirrors/

http://www.foodpolitics.com/2009/04/is-free-range-pork-more-contaminated-than-industrial-pork/

I grew up eating the pigs my grandfather raised, he didn't use antibiotics on them and no one ever got sick. But then again, we would cook the pork for hours in a spit until it was falling off the bone. I think the temperature the meat reaches when cooking has more to do with how safe it is than the way it was raised.

@popcornfordinner, for your information, you can safely eat alot of MRSA and not feel a thing. It's not a super toxic bug, just a hard to kill bug. Alot of humans are infact colonizers of MRSA anyways, you only worry about it if it is a skin infection that gets into your blood stream, stabbed, or immunocomprimised. Don't feed propaganda, and try to use words you don't know thanks...

This is great news for the chain of Pork Sushi restaurants that I'm kicking off later this year.

I'm really glad we're having a civilized discussion about this topic. Let's make sure we keep it on topic and also make sure we don't get into personal jibes. Popcornfordinner posted a great, relevant link in her comment to Marion Nestle's blog post on the editorial. Well worth reading.

jmf605: I was actually referring to the link between indiscriminate antibiotic use in pork factory farms and the rise of drug-resistant staph.

http://www.nytimes.com/2009/03/15/opinion/15kristof.html

http://www.nytimes.com/2007/12/16/magazine/16wwln-lede-t.html?_r=1

Wow Ed, normally I like your posts, but what you've done here is nearly the same as what you're railing against. The first thing you failed to recognize was that the article in question was an Op-Ed piece. That means it represents opinion over actual reporting of evidence and hence there's no reason for the editorial board to ask the author to be fair or balanced or informed. Second, have you read the actual journal article that the piece uses as its main evidence? Its free for anyone to read at the publishers website. While you and others may complain that it was industry funded research, as an actual research scientist that means little to me. Someone has to pay for such studies, and the pork board has a vested interest in knowing whether or not their management practices are the best. Free range or "confined" doesn't matter to them as long as it sells more pork. As for the article itself, there are numerous issues that I have with it in terms of the science conducted and how its been presented. That reflects the authors and NOT the pork industry. Should you fear eating free range pork because of the results, no. But should you also be concerned about the implications, yes.

Please, next time, think about the issue as a whole before you get all riled up over one small particular issue.

The Pork Board represents all commercial growers of pork, breed specific, free range and factory. They tell niche producers how to market, where to get certified, and try to keep them profitable and in business. To imply they have an agenda in this study, beyond proving pork is safe to eat, is beyond belief. Visit their web site and see what they do. If they have any agenda, it is to get people to eat as much pork as possible.

All federally inspected pork is lot tested for trichinae, and similar studies have been done by USDA, which have shown trichinae in free range pork. Why would anyone be suprised that an animal in uncontrolled outdoor conditions runs a greater risk of getting environmental infestations of parasites. The feral cats in major cities have toxoplamosis, why wouldn't free range pigs?

@popcornfordinner, sorry for the misinterpretation, nice links btw. I still believe MRSA risen more from antibiotic usage in humans though.

More on the subject of the story. I rather get pork roundworms than pork tapeworms =). I think it maybe useful, since we eat so much (includes me). I won't mind losing a few pounds to these worms.

@trialbyfood, yes, it was an op-ed piece, but it was published by the most powerful and influential paper in the country, and they should be more careful about what they print. i thought it was a ridiculous piece, myself, and i'm glad ed brought it up.

I agree with the sentiment that the original Op-Ed piece was neither alarmist nor biased. I think the point of it was to highlight the fact that raising pigs outdoors will increase the prevalence of various pathogens they are likely to encounter in the environment, which is why they were moved indoors in the first place. The increased risk to the human consumer may be negliglible, but it is increased nonetheless.

Ultimately I think that it is much more important to look at how confined pork production (along with most industrial ag techniques) may be responsible for the rise of MRSA. It is, I think, also good to note that there are two fairly distinct strains of MRSA -- "community acquired" and "hospital acquired." The hospital acquired strain results from the rampant use of antibiotics in hospitals, and I suspect it is responsible for the vast majority of MRSA-associated deaths due to the high-risk population one finds in a hospital. But the community acquired strain is most likely much much more prevalent, with most carriers having no infection. Staph aureus (the SA in MRSA) is, after all, the most common type of bacteria found on human skin. It is far more likely that the spread of MRSA is due to human-human transmission, and it is very unlikely to be a food-borne pathogen (as opposed to Salmonella, E. coli, trichinosis, etc.).

So if I am worried about whether *this* piece of pork will make me sick if I eat it, chances are the pork from a pig raised outdoors will be "less safe" than the one raised indoors. The risk is probably less than that of me getting sick from eating raw egg, raw fish/shellfish, and medium-cooked burgers, but I do all of those with reckless abandon. If I am worried about the epidemiologic and public health consequences of raising pigs certain ways, then it is clear that confined, go go antibiotics, industrial methods are far, far riskier.

My husband and I have decided that given what we know now, we will continue to cook and eat Berkshire, Red Wattle, Duroc, etc. pork after it has been frozen for two weeks or longer. It will be cooked to about 137*. Thanks, Ed, for this post. It has provoked a lot of discussion, and we have decided that this is how our family will proceed. We also spoke this afternoon to our farmer. She reads everything she can on such subjects when she isn't reading Proust or tending to the farm. We consider the source of the food we bring into our kitchen to be very important, and we always try to be aware of the bias, agenda, ambitions of the people providing information.

OK, so I read the study in question, because a few people asked me about it. I will say at the start that the op-ed was not my favorite, and as a former writer of pieces like this I detected all sorts of tricks clever opinion writers use to bend reality to their point of view; it is part of the craft.

But let's just take the writer at face value: The study he refers to looked at 329 "free range" hogs and tested them, and then found 2 -- yes, only 2 -- that had even the presence of antibodies for the trichinae parasite.

Now the presence of antibodies is not a 100 percent guarantor that the hog is infected. They probably do have trichinae worms, but the presence of antibodies also can mean that the hog has defeated the parasite at some point in its past and has a strengthened immune system because of it. (think Nietzsche)

But for the sake of argument, let's just say both of those hogs actually had trichinae: 2 pigs out of 329 is a REALLY good set of odds. Why? It's all about perception. Most consumers are still convinced ALL hogs carry trichinae worms, so given this, even the Gucci hogs are beating the odds.

So the bottom line for me is that I'd still rather buy pork from a "walkin' around pig" that had an honest immune system -- and yes, a less than 1 percent chance of carrying trichinae parasites -- than a factory hog. And I'll cook that walkin' around pig the way I like it: with a nice blush of pink at its center.

In the Philippines, I guess because they feed pigs with almost anything we've always cooked pork to well done. And that's the way i'm going to continue to make it. I think the problem with mass-produced pork here in the U.S. is that they have been bred to almost no taste (too lean) so cooking it well done taste like cardboard. I would love to try the pork from Flying pigs farm...it's on my list...chinese roast pig with their pork belly!

trichinosis is not caused by a bacteria, it's caused by a parasitic nematode, or roundworm, that forms cysts in host tissue. actually, there are three species of nematode that can cause trichinosis, t. spirialis, t. britovi, and t. nativa. all the fuss made about cooking pork to a higher temperature is because these worms form cysts, which are quite resistant to environmental changes (such as temperature), and note: bacteria do not form cysts. the worms form cysts because they are hoping to get ingested by another animal to continue their life cycle, and they need to be able to resist harsh environments such as stomach acids.

Trichinosis is a pain, literally. the worms live and form cysts in the muscle tissue of the host. And considering that to do that they burrow through your intestines and any other tissues in their way it is not great for your total health. I have worked with people who had gotten infested,and they assured me it is definitely not one of the things you want to put on your bucket list of to do's. If it were harmless, no one would be concerned.

To prevent infestation meat should be cooked to a minimum of 137 degrees farenheit, considereing most people can't or won't calibrate their thermometers, play it safe and go to 145, still rare, if that is what you desire.

Decades ago, when trichinosis was more common USDA gave us two other methods for destroying trichinae in meat.

Method 1 is freezing the meat at -20 degrees farenheit for 40 days, shorter times and higher temperatures may not work, this was known as certified Pork in the meat industry. this is also colder than most home freezers are run at.

The second method refers to dry cured meats. this required the meat to be treated with 3 1/2 percent salt for 40 days to destroy the encysted worms. The actual 40 days started when the product was fully salted, immediately with ground meat, think genoa salami or soppressata, but if it were a dry cured ham, it could take 60 days or longer for the salt to equilibrate to a minimum of 3.5% throughout the ham. That is why dry cured hams age for 4-6 months.

The reality here, is that people really know far less than they should about what they eat and how to prepare it. May people distrust real science for their gut feelings. Others are total cynics, maybe former hippies( oh the hate talk this will generate), who feel the system is out to get them and homogenize them. People, learn the real science, make sane decisions. Just because a Chef or Farmer tells you it won't hurt you to eat rare pork, or you read it on the internet (oh my god that is where I posted this!) doesn't make it 100% true.

Trust me, eating your pork a little dryer (Cooked to 145 to 150 degrees) is far better than trichinosis.

I'm with Meat guy -- I shoot for 145 degrees as well. It is still "blush of pink" that way, and still plenty juicy.

ed, i thought you might like to see what julie powell has to say: http://juliepowell.blogspot.com/

just FYi the editors decided to append a note disclosing the funding source of the studies used:
"Editors' Note: April 14, 2009
An Op-Ed article last Friday, about pork, neglected to disclose the
source of the financing for a study finding that free-range pigs were
more likely than confined pigs to test positive for exposure to
certain pathogens. The study was financed by the National Pork Board."

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