Trichinellosis

Trichinellosis is a parasitic disease caused by roundworms of the Trichinella species. Humans become infected by consuming raw or undercooked meat, typically pork or wild game, containing the parasite's larvae. It can affect anyone who eats contaminated meat and is found globally, though prevalence varies by region.

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What is Trichinellosis?

The causative parasite was first identified in human muscle tissue by Richard Owen in 1835. Rudolf Virchow later described its life cycle and transmission in the 1860s, leading to the implementation of strict meat inspection laws, particularly for pork, which significantly reduced human cases in many developed nations.

Symptoms

  • _Intestinal Phase (1-2 days post-infection):_ Nausea, diarrhea, vomiting, abdominal pain, fatigue, mild fever.
  • _Muscle Invasion Phase (1-2 weeks post-infection):_ Muscle pain and tenderness (myalgia), swelling of the face (especially around the eyes), fever, headache, weakness, and sometimes a rash or splinter hemorrhages under the nails. Severe cases can affect the heart or brain.

Transmission

Trichinellosis is transmitted to humans primarily through the consumption of raw or undercooked meat contaminated with *Trichinella* larvae. Common sources include domestic pork, wild boar, bear, walrus, and other omnivorous or carnivorous animals. It is not transmitted from person to person.

Contagious Period: Varies by disease

Prevention

  • Thoroughly cook all meat, especially pork and wild game, to an internal temperature of at least 160°F (71°C) until juices run clear.
  • Freeze pork less than 6 inches thick at 5°F (-15°C) for 20 days or -4°F (-20°C) for 3 days to kill most *Trichinella* species (some arctic species are resistant to freezing).
  • Avoid feeding raw meat scraps or offal to pigs.
  • There is no human vaccine available for Trichinellosis.

Active Outbreaks & Recent Cases

Real-time intelligence from global health monitoring and AI-powered surveillance

Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies

No Active Outbreaks Detected

Our AI-powered surveillance hasn't detected significant Trichinellosis activity in the past 30 days.

Real-time monitoring continues 24/7 across BEACON, ProMED, WHO, CDC, and 50+ global health agencies

What This Means

Currently, Trichinellosis case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.

Stay Prepared

Download the Virus Watcher app to get instant alerts if Trichinellosis activity increases in your region or travel destinations.

Prevention Remains Important

Even without active outbreaks, understanding Trichinellosis prevention helps protect you and your community:

  • Thoroughly cook all meat, especially pork and wild game, to an internal temperature of at least 160°F (71°C) until juices run clear.
  • Freeze pork less than 6 inches thick at 5°F (-15°C) for 20 days or -4°F (-20°C) for 3 days to kill most *Trichinella* species (some arctic species are resistant to freezing).
  • Avoid feeding raw meat scraps or offal to pigs.
  • There is no human vaccine available for Trichinellosis.
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Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

Global disease surveillance and guidelines from the World Health Organization

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Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-06-03

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