[Role of flies in the epizootiology of coccidiosis in poultry].

The possibility is shown Musca domestica L. to ingest considerable amounts of oocysts of Eimeria tenella which remain in their digestive tract during 120 hrs. Both sporulated and non-sporulated oocysts remain viable and infectable. Non-sporulated oocysts do not form spores in the digestive tracts of flies, but after their excretion, they terminate normally their development under favourable conditions. It is shown that when flies, infected with oocysts, are fed to susceptible chicks, they are affected with coccidiosis.