Balantidium coli


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Ba·lan·ti·di·um co·'li

a very large parasitic ciliate species, usually 50-80 mcm in length, reaching up to 200 mcm in pigs, found in the cecum or large intestine, swimming actively in the lumen; usually harmless in humans but may invade and ulcerate the intestinal wall, producing a colitis resembling amebic dysentery.

Balantidium coli

[bal′əntid′ē·əm]
Etymology: Gk, balantidion, little bag, kolon, colon
the largest and the only ciliated protozoan species that is pathogenic to humans, causing balantidiasis. The organism is seen in two life stages: the motile trophozoite and the encysted cercaria. It is a normal inhabitant of the domestic hog and is transmitted to humans by the ingestion of cysts excreted in hog feces, occurring either during direct contact with pigs, handling of fertilizer that contains pig excrement, or contact with a water supply contaminated with excrement.

Ba·lan·ti·di·um co·li

(bal-an-tid'ē-ŭm kō'lī)
A very large parasitic ciliate species, usually 50-80 mcm in length (to 200 mcm in pigs) found in the cecum or large intestine, swimming actively in the lumen; usually harmless in humans but may invade and ulcerate the intestinal wall, producing a colitis resembling amebic dysentery.
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BALANTIDIUM COLI CYST: (×400)

Balantidium coli

A normal parasite of swine and the largest protozoan parasite of humans. It causes balantidiasis. See: illustration
See also: Balantidium

Balantidium

a genus of ciliated protozoa, including many species found in the intestine in vertebrates and invertebrates, predominantly in primates, pigs and humans. See also balantidiasis.

Balantidium coli
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Necrotizing lung infection caused by the protozoan Balantidium coli.
Balantidium coli pneumonia in an immunocompromised patient.
22] Balantidium coli are the largest single-celled human parasite and measure 50 to 100 x 40 to 70 [micro]m.