parasite

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Rare bear meat at gathering gives 10 people a scare—and parasitic worms

bear, CDC, health, infectious diseases, Meat, outbreak, parasite, Science, trichinella, trichinellosis / /

If you’re going to eat a bear, make sure it’s not rare.

You’d be forgiven for thinking that once the beast has been subdued, all danger has passed. But you might still be in for a scare. The animal’s flesh can be riddled with encased worm larvae, which, upon being eaten, will gladly reproduce in your innards and let their offspring roam the rest of your person, including invading your brain and heart. To defeat these savage squirmers, all one must do is cook the meat to at least 165° Fahrenheit.

But that simple solution continues to be ignored, according to a report today in the Centers for Disease Control and Prevention’s Morbidity and Mortality Weekly Report. In this week’s issue, health officials in North Carolina report that rare bear meat was served at a November 23 gathering, where at least 22 people ate the meat and at least 10 developed symptoms of a worm infection. Of the 10, six were kids and teens between the ages of 10 and 18.

The infection is from the roundworm Trichinella, which causes trichinellosis. While the infection is rarely fatal, the nematodes tend to burrow out of the bowels and meander through the body, embedding in whatever muscle tissue they come across. A telltale sign of an infection in people is facial swelling, caused when the larvae take harbor in the muscles of the face and around the eyes. Of the 10 ill people in North Carolina, nine had facial swelling.

Local health officials were onto the outbreak when one person developed flu-like symptoms and puzzling facial swelling. They then traced it back to the gathering. The report doesn’t specify what kind of gathering it was but noted that 34 attendees in total were surveyed, from which they found the 22 people who ate the rare meat. The 10 people found with symptoms are technically considered only “probable” cases because the infections were never diagnostically confirmed. To confirm a trichinellosis infection, researchers need blood samples taken after the person recovers to look for antibodies against the parasite. None of the 10 people returned for blood draws.

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Human cases of raccoon parasite may be your best excuse to buy a flamethrower

Baylisascaris procyonis, eggs, health, infectious diseases, larvae, parasite, raccoon, roundworm, Science / /

kill it with fire —

The infection is very rare, but it’s definitely one you want to avoid.

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Young raccoon looking out from a tree.

Enlarge / Young raccoon looking out from a tree.

If you were looking for a reason to keep a flamethrower around the house, you may have just found one.

This week, the Los Angeles County health department reported that two people were infected with a raccoon parasite that causes severe, frequently fatal, infections of the eyes, organs, and central nervous system. Those who survive are often left with severe neurological outcomes, including blindness, paralysis, loss of coordination, seizures, cognitive impairments, and brain atrophy.

The parasitic roundworm behind the infection, called Baylisascaris procyonis, spreads via eggs in raccoons feces. Adult worms live in the intestines of the masked trash scavengers, and each female worm can produce nearly 200,000 eggs per day. Once in the environment, those eggs can remain infectious for years. They can survive drying out as well as most chemical treatments and disinfectants, including bleach.

Humans get infected if they inadvertently eat soil or other material that has become contaminated with egg-laden feces. Though infections are rare—there were 29 documented cases between 1973 and 2015—younger children and people with developmental disabilities are most at risk.

For instance, an 18-month-old boy with Downs syndrome in Illinois died from the infection after he chewed and sucked on pieces of contaminated firewood bark. An autopsy later found three worm larvae per gram of his brain tissue, with a total estimated burden of 3,027 parasitic larvae, according to a 2016 report.

Burn it down

In a news release this week, the LA health department said the risk to the general public is “low” but that the two cases are “concerning because a large number of raccoons live near people, and the infection rate in raccoons is likely high. The confirmed cases of this rare infection are an important reminder for all Los Angeles County residents to take precautions to prevent the spread of disease from animals to people, also known as zoonotic disease.”

According to the Centers for Disease Control and Prevention, one of the best prevention methods for raccoon roundworms is to kill it with fire. While chemicals stand little chance of killing off infectious eggs, extreme heat destroys them instantly.

If you have raccoons around your property, you might need to employ this method. Raccoons tend to poop in communal, pungent latrines, which are often at the base of trees, on raised surfaces—such as tree stumps, woodpiles, decks, and patios—as well as in attics and garages.

If you suspect you have an outdoor raccoon latrine on your property, the CDC recommends dousing the area in boiling water or setting it ablaze. While the CDC recommends a propane torch, specifically, a personal flamethrower could also do the trick. The agency does caution that flaming a latrine site “could cause a fire, burn injury, or surface damage.”

“Before flaming any latrine site, call your local fire department for details on local regulations and safety practices,” the CDC says. “Concrete pads, bricks, and metal shovels or garden implements can be flamed without damage. Do not attempt to flame surfaces that can melt or catch fire.”

For indoor latrines, the CDC advises not to use fire. Instead, it outlines a cautious cleaning method with hot, soapy water. However, if you want, any removed feces or contaminated material can be flamed outside, if not buried or put in the trash.

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Family stricken with rare brain worms after eating undercooked bear

bear, brain worms, CDC, health, Meat, parasite, Science, trichinellosis, undercooked / /

Unbearably gross —

In the parasite vs. bear vs. human battle, the grizzly parasite comes out on top.

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American black bear seen along the Red Rock Parkway inside Waterton Lakes National Park in Alberta, Canada.

Enlarge / American black bear seen along the Red Rock Parkway inside Waterton Lakes National Park in Alberta, Canada.

In the summer of 2022, a family gathered in South Dakota for a reunion that included a special meal—kabobs made with the meat of a black bear that one of the family members had “harvested” from northern Saskatchewan, Canada, that May. Lacking a meat thermometer, the family assessed the doneness of the dark-colored meat by eye. At first, they accidentally served it rare, which a few family members noticed before a decision was made to recook it. The rest of the reunion was unremarkable, and the family members departed to their homes in Arizona, Minnesota, and South Dakota.

But just days later, family members began falling ill. One, a 29-year-old male in Minnesota, sought care for a mysterious illness marked by fever, severe muscle pains, swelling around his eyes (periorbital edema), high levels of infection-fighting white blood cells (eosinophilia, a common response to parasites), and other laboratory anomalies. The man sought care four times and was hospitalized twice in a 17-day span in July. It wasn’t until his second hospitalization that doctors learned about the bear meat—and then it all made sense.

The doctors suspected the man had a condition called trichinellosis and infection of Trichinella nematodes (roundworms). These dangerous parasites can be found worldwide, embedded into the muscle fibers of various carnivores and omnivores, according to the Centers for Disease Control and Prevention. But, it’s quite rare to find them in humans in North America. Between 2016 and 2022, there were seven outbreaks of trichinellosis in the US, involving just 35 cases. The majority were linked to eating bear meat, but moose and wild boar meat are also common sources.

Trichinella nativa infections—Arizona, Minnesota, and South Dakota, 2022.” height=”396″ src=”https://cdn.arstechnica.net/wp-content/uploads/2024/05/mm7320a2-F-large-640×396.webp” width=”640″>

Enlarge / Microscopic examination of encapsulated larvae in a direct black bear meat muscle squash prep (A), larvae liberated from artificially digested bear meat (B), and motile larvae viewed with differential interference contrast microscopy (C and D)from black bear meat suspected as the source of an outbreak of human Trichinella nativa infections—Arizona, Minnesota, and South Dakota, 2022.

Once eaten, larvae encased in the meat are released and begin to invade the small intestines (the gastrointestinal phase), causing pain, diarrhea, nausea, and vomiting. Then, the larvae develop into adults in the gut, mate, and produce more larvae there. The second generation of worms then go wandering through the lymphatic system, into the blood, and then throughout the body (systemic phase). The larvae can end up all over, reaching skeletal muscles, the heart, and the brain, which is rich in oxygen. The systemic phase is marked by fever, periorbital edema, muscle pain, heart inflammation, and brain inflammation. The larvae can also provoke severe eosinophilia, particularly when they move into the heart and central nervous system.

The man’s symptoms fit the case, and several tests confirmed the parasitic infection. Of eight interviewed family members present for the bear-meat meal, six people had illnesses matching trichinellosis (ranging in age from 12 to 62), and three of them were hospitalized, including the 12-year-old. Four of the six sickened people had eaten the bear meat, while two only ate vegetables that were cooked alongside the meat and cross-contaminated. Experts at the CDC obtained leftover frozen samples of the bear meat, which revealed moving larvae. Testing identified the worm as Trichinella nativa, a species that is resistant to freezing.

In an outbreak study published Thursday in the CDC’s Morbidity and Mortality Weekly Report, health officials from Minnesota and the CDC reported that the three hospitalized patients were treated with the anti-parasitic drug albendazole and recovered. The remaining three cases fortunately recovered without treatment. The health experts noted how tricky it can be to identify and diagnose these rare cases but flagged periorbital edema and the eosinophilia as being key clinical clues to the grizzly infections. And, above all, people who are going to eat wild game meat should invest in a meat thermometer and make sure the meat is cooked to at least ≥165° F (≥74° C) to avoid risking brain worms.

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