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It is not a worm, bacteria, or virus! Giardiasis is an intestinal infection in humans and animals, caused by a microscopic protozoan parasite. Giardia has two forms: • A trophozoite that lives in the gut of infected animals • A cystic stage that’s shed in the dog's stool The cyst form can survive for several months in the environment ... especially in water or damp conditions. If your dog swallows the cyst, it enters his intestines. Once there, it transforms into the trophozo