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Giardiasis

(Giardia Infection)

Giardiasis (GEE-are-DYE-us-sis) is caused by a microscopic parasite Giardia intestinalis (also known as Giardia lamblia or Giardia duodenalis). The parasite is found on surfaces or in soil, food, or water that has been contaminated with the feces from infected humans or animals. People can become infected after accidentally swallowing the parasite. Giardia causes diarrheal illness, and giardiasis is a common cause of waterborne disease in humans in the United States. There are several prescription medicines available to treat Giardia infection.

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This page last reviewed November 12, 2008

Centers for Disease Control and Prevention
National Center for Zoonotic, Vector-Borne, and Enteric Diseases (ZVED)
Division of Parasitic Diseases