The Species of Cryptosporidium (Apicomplexa: Cryptosporidiidae) Infecting Mammals

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Abstract
Oocysts of Cryptosporidium muris (Apicomplexa: Cryptosporidiidae) were obtained from the feces of naturally infected calves. Oocysts were fully sporulated in fresh feces, measured 7.4 .times. 5.6 (6.6-7.9 .times. 5.3-6.5) .mu.m, and possessed a longitudinal suture along one pole of the oocyst wall. Morphological and biologic evidence obtained from this study demonstrated that C. muris is a species distinct from Cryptosporidium parvum, which has smaller oocysts.