Giardia (say gee-ar-dee-ah) is the name of a microscopic parasite that can live in the human bowel. The sickness that this parasite causes is called giardiasis (say gee-ar-dye-a-sis). Some symptoms of giardiasis are diarrhea, belching, gas and cramps. Although these problems are very unpleasant, the illness isn't usually dangerous.

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