Fascioliasis is a parasitic infection caused by liver flukes, primarily Fasciola hepatica or Fasciola gigantica. It affects humans and various grazing animals, being most common in regions with livestock farming and specific freshwater snails. The flukes primarily inhabit the bile ducts and liver.
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Liver flukes were recognized in livestock centuries ago, with *Fasciola hepatica* first described in sheep in the 16th century. Human cases gained clearer understanding in the 19th and 20th centuries as the parasite's life cycle and transmission routes were elucidated. It has long been a significant cause of economic losses in livestock and an underestimated public health problem.
Humans contract Fascioliasis by ingesting metacercariae, the infective larval stage, which are typically found encysted on raw or undercooked aquatic plants (like watercress) or in contaminated water. After ingestion, metacercariae excyst in the intestine, penetrate the gut wall, and migrate through the peritoneal cavity to the liver, eventually settling in the bile ducts where they mature. Freshwater snails serve as the intermediate hosts in the parasite's life cycle.
Contagious Period: Varies by disease
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Our AI-powered surveillance hasn't detected significant Fascioliasis activity in the past 30 days.
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Currently, Fascioliasis case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.
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Even without active outbreaks, understanding Fascioliasis prevention helps protect you and your community:
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Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →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: 2026-07-18
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