Isospora sp. (Protozoa: Eimeriidae) from Cattle and Its Relationship to I. lacazei of the English Sparrow

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Abstract
A sp. of Isospora with subspherical to spherical oocysts 27 by 25 u in diameter was observed in the feces of 6 cattle on 3 farms in central Illinois. It was thought at first to be a new sp., but a comparison with the oocysts of L lacizei of the English sparrow (Passer domesticus) revealed that the 2 forms were practically indistinguishable, so that the oocysts found in bovine feces may well be those of I. lacazei. It was estimated that every oocyst found could represent an initial contamination of a day''s feed with about 45,500 oocysts, and that it was quite likely that sparrow coccidia could be detected in an animal''s feces if it ate only a single sparrow. The literature on taxonomy and morphology of I. lacazei from passeriform birds is reviewed and its oocysts are redescribed from the English sparrow. They measure 18-29 x 17-27 [mu] with a mean of 24x22 [mu]. Future work may show that several sp. are actually now being lumped under this name.

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