Giardiasis is an intestinal infection caused by the microscopic parasite Giardia duodenalis (also known as Giardia intestinalis or Giardia lamblia). It's one of the most common causes of waterborne disease globally, affecting people of all ages but particularly common in areas with poor sanitation and among travelers, campers, and children.
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The parasite **Giardia** was first observed by Antonie van Leeuwenhoek in his own stool in 1681 using his microscope. It was later formally described by Dr. Vilém Lambl in 1859, leading to its classification and eventual recognition as a major cause of diarrheal disease worldwide, especially with the rise of modern public health and epidemiology.
Giardiasis primarily spreads through the fecal-oral route, meaning the ingestion of **Giardia** cysts found in the feces of an infected person or animal. This commonly occurs by drinking contaminated water (the most frequent route), eating contaminated food, or through direct person-to-person contact, particularly in settings with poor hygiene or communal living.
Contagious Period: Varies by disease
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Our AI-powered surveillance hasn't detected significant Giardiasis activity in the past 30 days.
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Currently, Giardiasis case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.
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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: 2026-06-03
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