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Detection of Intestinal Parasites


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Life Cycle of Giardia

Slide 17

March 2009

Shown here is the life cycle of Giardia. Let’s start at the stage that’s infectious to humans: the cyst stage in contaminated food, water, fingers, or fomites. Fomites are inanimate objects that can serve as a vehicle for infectious diseases.

These cysts are ingested by humans and exist in the small intestine, releasing the trophozoite. This stage adheres to the small intestine, resulting in decreased absorption and diarrhea. Cysts and trophozoites are then passed out in the stool to infect the next person.

Life Cycle of Giardia


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