Tyzzeria

A genus of coccidia (family Eimeriidae) in which the oocyst contains eight naked sporozoites. Important species are T. anseris, a relatively nonpathogenic species found in the small intestine of domestic and wild geese, whistling swans, and certain wild ducks, and T. perniciosa, which occurs in the small intestine of the domestic duck in North America and Europe, and is pathogenic in ducklings.

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Tyz·ze·ria (ti-zērґe-ə) a genus of coccidian protozoa (suborder Eimeriina, order Eucoccidiida), characterized by the presence of oocysts containing eight naked sporozoites. T. pernicioґsa is highly pathogenic for domestic ducklings, being parasitic in the small intestine, especially in the upper half.