GIARDIASIS:

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Giardiasis is a diarrheal illness caused by a one-celled, microscopic parasite. Because an outer shell protects the parasite, it can survive outside the body and in the environment for long periods of time.

Cause: The Giardia parasite lives in the intestine of infected humans or animals. Millions of germs can be released in a bowel movement from an infected human or animal. Infection can occur after accidentally swallowing the parasite. Infection cannot occur through contact with blood.

Symptoms: There are a variety of intestinal symptoms, which include diarrhea, gas or flatulence, greasy stools, stomach cramps, upset stomach or nausea.

Sources

Center for Disease Control and Prevention on Giardiasis

Official website for Center for Disease Control and Prevention

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