Balantidium

(băl-ăn-tĭd′ē-ŭm)

[Gr. balantidion, a bag]
A genus of ciliated protozoa. A number of species are found in the intestines of both vertebrates and invertebrates.

Balantidium coli

A normal parasite of swine and the largest protozoan parasite of humans. It causes balantidiasis.

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BALANTIDIUM COLI CYST (×400)