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Interaction of Reovirus and Cryptosporidium baileyi in Experimentally Infected Chickens

1988; American Association of Avian Pathologists; Volume: 32; Issue: 3 Linguagem: Inglês

10.2307/1590901

1938-4351

James S. Guy, Michael G. Levy, David H. Ley, H. John Barnes, Thomas M. Gerig,

Parasitic Infections and Diagnostics

SUMMARY. No clinical signs, gross lesions, or increased mortality were observed in specificpathogen-free chickens orally inoculated at 5 days of age with Cryptosporidium baileyi, reovirus 2035, reovirus 2408, or combinations of these agents. Weight gain of chickens inoculated with only reovirus 2408 was depressed 0-8 days postinoculation (PI) (P < 0.01) but not for the 21day period PI. Weight gain of chickens inoculated with only reovirus 2035 was not affected. Cryptosporidium baileyi infection significantly depressed weight gain 8-14 days PI but not for the entire 21-day period PI. Weight gain of chickens infected with both C. baileyi and reovirus 2035 was significantly depressed 0-14 days PI and for the entire 21-day period PI. Dual infection with C. baileyi and either reovirus appeared to promote shedding of both agents. Cryptosporidia were found principally in the rectum 2-10 days PI and in the bursa of Fabricius 6-10 days PI. Reovirus infection did not cause any microscopic lesions and did not modify lesions caused by C. baileyi infection.