Increased susceptibility of bobwhites (Colinus virginianus) to Histomonas meleagridis after exposure.

Bobwhites given heterakid eggs but no Sevin became infected with cecal histomonads, but there was no pathological histomoniasis. Quail given 50 microgram of Sevin (10 microgram/day) behaved normally, but at necropsy they had slightly discolored livers. Quail given various doses of heterakid eggs and Sevin (Sevin increasing from 2.5 to 50 microgram) and those given various doses of heterakid eggs and 10 microgram/day of Sevin developed pathological histomoniasis and mortality rates of 36 and 63%, respectively.