Giardiasis is an infection of the small bowel by a single-celled organism called Giardia lamblia. People become infected with the Giardia parasite after swallowing Giardia cyst often found in water contaminated by raw sewage or animal waste.
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Giardia lamblia was originally identified by von Leeuwenhoek in the 1600s and was first recognized in human stool by Vilem Dusan Lambl (1824-1895) in 1859 and by Alfred Giard (1846-1908) after whom it is named.
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