Isospora Species in the Dog

Abstract
In a survey of 139 dogs from Illinois, Isospora bigemina was found in 1%, I rivolta in 18%, I canis in 16%, and free sporocysts considered to be of I. rivolta in 3%. The sporulated oocysts of I. bigemina measured 10 to 14 by 10 to 12 [mu], those of I. rivolta were 20 to 27 by 15 to 24 [mu], those of I. canis were 35 to 42 by 27 to 33 [mu], and the free sporocysts were 15 to 17 by 10 to 11 [mu]. Abnormal, Caryospora-like oocysts of I. rivolta were found in one dog, and of I. canis in another.

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