The developmental cycle of Caryospora bubonis ...

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Title The developmental cycle of Caryospora bubonis Cawthorn and Stockdale 1981 (Protozoa: Eimeriidae) in the great horned owl, Bubo virginianus (Gmelin)
Author(s) Richard J. Cawthorn, P. H. G. Stockdale
Journal Canadian Journal of Zoology
Date 1982
Volume 60
Issue 2
Start page 152
End page 157
Abstract Three B. virginianus were fed oocysts of C. bubonis and 3 were each fed 2 mice which had been orally infected with sporulated oocysts of C. bubonis 4 weeks previously. Faeces were examined daily by flotation and daily oocyst production was estimated. One B. virginianus was given sporulated oocysts of C. bubonis and was killed for examination 12 days after infection when oocysts were first detected in the faeces. 2 Asio otus, one A. flammeus and domestic chicks were fed sporulated oocysts of C. bubonis, and their faeces were examined as above. Mice were given varying doses of sporulated oocysts of C. bubonis orally and were killed sequentially after infection. Tissues from the mice and chicks were examined histologically. In B. virginianus directly infected with C. bubonis the prepatent period was 12 days, the patent period was 4 to 11 days and maximal oocyst production occurred from 12 to 17 days after infection. In indirectly infected owls the prepatent period was shortened by 48 h. No clinical signs were observed. Endogenous development occurred in the posterior third of the small intestine. C. bubonis was not transmitted to the other species of birds, and no lesions were observed in the chickens or mice..

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