A microscopic parasite, Giardia, feeds off of other organisms to survive. It causes an infection in the intestines called giardiasis and passes from the body in the feces. Foul-smelling, bright yellow diarrhea is a symptom of the condition. Individuals can be infected if they come into contact with infected surfaces, people, or bodies of water where Giardia bacteria live. Eating uncooked food that contains the organisms can also lead to infection.

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