Causes of Infection
Trichinosis is caused by a microscopic parasite called Trichinella. People contract the infection by eating raw or undercooked meat that contains the larvae of this roundworm. Once the meat is consumed, digestive juices break down the cyst surrounding the larvae in the stomach. The larvae then move to the small intestine, mature into adults, and reproduce. The new larvae enter the bloodstream and migrate to muscle tissues, where they curl up and form cysts. The most common source of infection is pork, but outbreaks also frequently occur from consuming wild game such as bear, wild boar, cougar, or walrus.

Risk Factors
Certain behaviors and environmental factors increase the likelihood of contracting this condition.

• Consuming raw or rare meat, particularly pork or wild game
• Eating homemade jerky or sausages that were not processed safely
• Raising pigs in environments where they have exposure to garbage or rodents
• Using meat grinders for wild game without thorough cleaning between uses

Prevention Strategies
Prevention relies entirely on safe food handling and preparation practices. There are currently no vaccines to prevent trichinosis. Reducing the severity of the illness is not possible once infected meat is consumed, so primary prevention is key.

• Cook whole cuts of meat (excluding poultry) to at least 145°F (63°C) and let them rest for three minutes before eating
• Cook ground meat and wild game to an internal temperature of at least 160°F (71°C)
• Freeze pork less than 6 inches thick at 5°F (-15°C) for at least 20 days to kill certain types of worms
• Understand that freezing does not kill the parasite strains typically found in wild game like bear
• Clean meat grinders thoroughly to prevent cross-contamination

Signs and Symptoms
Symptoms of trichinosis typically appear in two stages. The first stage involves the gastrointestinal tract and usually begins 1 to 2 days after consuming infected meat. As the parasites migrate to the muscles, the second stage begins, usually within 2 to 8 weeks. Severity often depends on the number of larvae consumed. Mild cases may have no noticeable symptoms.

• Nausea, vomiting, diarrhea, and abdominal pain (Stage 1)
• High fever and chills
• Muscle pain and tenderness (myalgia)
• Swelling of the face, particularly around the eyes (periorbital edema)
• Fatigue and weakness
• Headache and sensitivity to light
• Small hemorrhages under the fingernails (splinter hemorrhages)

Diagnosis
Clinicians identify trichinosis through a combination of patient history and medical tests. Because the symptoms often resemble the flu or other common illnesses, a history of eating undercooked or wild meat is a crucial clue for diagnosis.

• Blood tests to check for an elevated number of eosinophils (a type of white blood cell)
• Antibody tests to detect the immune system's response to the parasite (may not show positive results until weeks after infection)
• Muscle biopsy (rarely used now) to look for larvae in the tissue

Medical Treatment
The primary goal of treatment is to eliminate the parasite and reduce inflammation. If the infection is identified very early, antiparasitic medications such as albendazole or mebendazole can be effective in preventing larvae from encysting in the muscles. Once the larvae have established themselves in the muscles, these drugs may be less effective at killing the cysts but are often still prescribed. Corticosteroids may be used to manage allergic reactions to the parasites and to reduce severe muscle inflammation. Analgesics and pain relievers are frequently used to manage muscle soreness and fever.

Management and Self-Care
Recovery often requires rest and supportive care at home. Staying hydrated and getting plenty of sleep helps the body fight the infection. Patients should avoid strenuous physical activity while experiencing muscle pain. It is important to note that symptoms can linger, and patience is required during recovery.

When to Seek Medical Care
You should see a doctor if you develop digestive problems or flu-like symptoms after eating undercooked meat or wild game. Immediate medical attention is warranted if symptoms escalate.

• Severe abdominal pain or vomiting
• High fever that does not improve
• Significant swelling of the face or eyes
• Difficulty breathing or heart palpitations

Severity and Disease Course
Trichinosis ranges from asymptomatic (mild cases) to severe and potentially life-threatening. Most mild cases resolve on their own within a few months, although treatment speeds up recovery and prevents complications. The acute illness typically lasts a few weeks, but fatigue, mild pain, and diarrhea may persist for months. The severity is generally correlated with the number of larvae ingested.

Complications
While rare, heavy infections can lead to serious complications if the larvae migrate to vital organs. These complications are the primary cause of the rare fatalities associated with the disease. Long-term effects are uncommon once the acute infection resolves.

• Myocarditis (inflammation of the heart muscle)
• Encephalitis (inflammation of the brain)
• Meningitis (inflammation of the membranes around the brain and spinal cord)
• Pneumonia or breathing difficulties

Prognosis
The overall prognosis is very good. Most people make a complete recovery with no lasting effects. Prompt medical treatment improves outcomes and reduces the risk of severe inflammation. Death from trichinosis is extremely rare in modern clinical settings.

Impact on Daily Activities
During the active phase of the infection, individuals may need to take time off from work or school due to fever, pain, and fatigue. The muscle pain can limit physical mobility, making exercise and manual labor difficult. Digestive issues may also require staying close to a restroom. Coping involves allowing the body time to heal and not rushing back to strenuous activity.

Questions to Ask Your Healthcare Provider
Bringing a list of questions to your appointment can help ensure you understand your care plan.

• Is it safe for me to return to work, or am I contagious?
• How long should I expect the muscle pain to last?
• Are there any side effects to the antiparasitic medication?
• Do I need to test family members who ate the same meal?
• What signs of complications should I watch for?

Q: Is trichinosis contagious from person to person?
A: No, you cannot catch trichinosis from another person. It is only acquired by eating meat that contains the parasite larvae.

Q: Does smoking, salting, or drying meat kill the parasite?
A: No, these methods are generally not effective at killing the Trichinella larvae. Only proper cooking and, in some cases, specific freezing techniques are reliable methods.

Q: How do I know if the meat I bought is safe?
A: Commercial pork in many developed countries is very safe due to strict regulations. However, the best way to ensure safety for any meat is to use a meat thermometer to check that it has reached the recommended internal temperature.

Q: Can I get trichinosis from vegetables?
A: It is extremely unlikely. The parasite lives in muscle tissue, so transmission requires consuming infected animal flesh.

Q: How long do the larvae live in the body?
A: The adult worms in the intestine live for a few weeks. The larvae that migrate to the muscles can form cysts and survive for years, but they usually calcify and die over time, causing no further symptoms.