Pork, wild game, and certain raw fish carry the highest parasite risks of any commonly eaten meats. The specific parasites differ by animal, but these three categories consistently top the list in both infection rates and potential harm to humans. Poultry and beef carry lower but still real risks, particularly from a single-celled parasite called Toxoplasma that ranks as the most burdensome foodborne parasite in the United States.
Pork: The Highest Overall Risk
Pork has long been the meat most associated with parasitic infection, and for good reason. It can harbor roundworms that cause trichinosis, tapeworm cysts, and Toxoplasma. The risk varies dramatically depending on how the pig was raised. A global meta-analysis found that pigs raised in non-intensive (outdoor or small-farm) systems had a Trichinella prevalence of about 6.1%, compared to just 0.1% in industrialized indoor operations. That 60-fold difference explains why trichinosis is now rare in countries with large-scale commercial pork production but remains a serious concern in parts of Asia, Africa, and Eastern Europe.
Toxoplasma is the other major worry with pork. In one European food safety assessment, 58.8% of pigs that tested positive for Toxoplasma antibodies had detectable parasites in their tissue, the highest rate of any meat animal tested. Pigs with outdoor access are significantly more likely to pick up Toxoplasma from contaminated soil. The tapeworm Taenia solium also cycles through pigs, and its larval cysts in pork can cause serious neurological disease in humans if ingested.
Wild Game: Bear, Boar, and Venison
Wild animals live in constant contact with parasite-laden soil, prey, and water, so their meat tends to carry a wider variety of parasites than farm-raised livestock. Bear meat is one of the riskiest foods you can eat undercooked. Bears are omnivores that scavenge carcasses, making them frequent hosts for Trichinella species. Unlike the roundworms in commercial pork, the Trichinella strains found in bears (particularly T. nativa) can survive freezing, which means the standard home-freezer method of killing parasites may not work.
Wild boar shares many of the same risks as domestic pork but without the controlled environment. Studies in Estonia detected multiple Trichinella species in wild boar populations, including T. pseudospiralis, T. britovi, and T. spiralis. The prevalence was low in that region (around 0.02% for one species), but boar populations in warmer climates or areas with higher wildlife density can have substantially higher rates.
Venison presents a different risk profile. Deer are commonly infected with Toxoplasma gondii, and documented outbreaks of acute toxoplasmosis have been linked to undercooked deer meat. The CDC has reported clusters among deer hunters in the U.S., and researchers have noted that as human seroprevalence for Toxoplasma declines (meaning fewer people have built up immunity), outbreaks from venison could become more common.
Raw Fish: A Parasite Hotspot
Fish don’t get the same reputation as pork, but raw or undercooked fish is one of the most common sources of parasitic infection worldwide. The main culprit is a roundworm larva called Anisakis, which burrows into the flesh of ocean fish. A study of four commercial fish species off the coast of Peru found an overall Anisakis prevalence of 53.7%, with nearly 1,000 larvae recovered from 345 fish. Hake had the highest infection rate at nearly 78%, followed by jack mackerel at about 65% and chub mackerel at 45%.
These aren’t exotic species. Mackerel, hake, herring, cod, and wild salmon are all common Anisakis hosts worldwide. When you swallow a live larva in raw or lightly cured fish, it can embed in your stomach or intestinal wall, causing sudden sharp pain, nausea, and vomiting. The condition, called anisakiasis, is most frequently reported in Japan and Spain, where raw and marinated fish dishes are popular.
Freshwater fish carry their own risks, particularly broad fish tapeworm from species like pike, perch, and freshwater salmon. Sushi-grade fish sold in the U.S. is required to be frozen before sale specifically to kill these parasites.
Beef and Poultry: Lower but Not Zero
Beef is generally considered one of the safer meats when it comes to parasites, but it does carry the beef tapeworm (Taenia saginata). Prevalence varies widely by region: meat inspection data from Egypt found rates ranging from 0.2% in native cattle at large slaughterhouses up to 20% in one local survey, while Israel reported rates around 0.4%. In the U.S. and Western Europe, modern inspection systems catch most infected carcasses, making beef tapeworm uncommon.
Poultry is rarely a source of parasitic infection for humans. The main theoretical risk is Toxoplasma. Chickens raised with outdoor access are more likely to be infected, and one European analysis found that 53.4% of seropositive chickens had detectable parasites, a rate second only to pigs. In practice, though, poultry is almost always cooked to a high internal temperature (165°F/74°C), which destroys Toxoplasma cysts completely. Only one reported outbreak has ever been linked to a chicken dish.
Why Toxoplasma Deserves Special Attention
When researchers rank foodborne parasites by their total health impact, Toxoplasma gondii consistently comes out on top in high-income countries. In the United States, it ranks as the most burdensome foodborne parasite, largely because of the severe damage it can cause to developing fetuses and people with weakened immune systems. In Greece, a similar ranking placed Toxoplasma second only to a tapeworm that cycles through dogs and sheep.
Toxoplasma is uniquely dangerous because it infects virtually all warm-blooded animals. Pork, lamb, goat, venison, and even chicken can all carry tissue cysts. A nationwide study in the U.S. found that about 13.2% of people over age six had antibodies to Toxoplasma, meaning they’d been infected at some point. Most healthy adults never notice the infection, but it can cause blindness or brain damage in babies born to newly infected mothers.
Safe Cooking and Freezing Temperatures
Cooking meat to the right internal temperature is the most reliable way to kill parasites. The thresholds differ by meat type:
- Beef, pork, lamb, goat, and veal steaks or roasts: 145°F (63°C) with a 3-minute rest
- Ground beef, pork, or lamb: 160°F (71°C), no rest needed
- Wild game (venison, rabbit, boar): 160°F (71°C)
- All poultry: 165°F (74°C)
For fish you plan to eat raw, freezing can kill most parasites. The FDA recommends freezing at -4°F (-20°C) for 7 days, or at -31°F (-35°C) until solid and then holding for 15 hours. Home freezers typically run around 0°F (-18°C), which is warmer than the FDA standard, so they may need longer to be effective. These freezing protocols do not reliably kill Trichinella species found in bear meat or other arctic wildlife, which have evolved to survive cold temperatures.
The wild game category stands apart because it requires a higher cooking temperature than standard pork or beef, and freezing cannot be trusted as a backup for all species. If you hunt or receive wild game, treating it like poultry in terms of cooking thoroughness is the simplest safety rule.