Giardia lamblia (also known as Lamblia intestinalis and Giardia duodenalis) is a parasite that infects the intestines and causes giardiasis or 'beaver fever'. Giardia affects humans, cats, dogs and birds, cows, beavers, deer, and sheep.

Giardia lamblia
Giardia lamblia SEM 8698 lores.jpg
Giardia cell, SEM
Scientific classification
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Binomial name
Giardia lamblia
Parasite life cycle (click to enlarge).