Abstract
Levine (1984, Journal of Protozoology 31: 9498) reviewed taxonomy and cross-transmission studies of members of the genus Cryptosporidium (Apicomplexa: Cryptosporidiidae). Based on the class of vertebrate that they infected, he considered that there were 4 valid species: Cryptosporidium muris Tyzzer, 1907, in mammals, C. crotali Triffit, 1925, in reptiles, C. meleagridis Slavin, 1955, in birds, and C. nasorum Hoover, Hoerr, Carlton, Hinsman, and Ferguson, 1981, in fish. However, Upton and Current (1985, Journal of Parasitology 71: 625-629) demonstrated, based on oocyst size, that both C. parvum Tyzzer, 1912, and C. muris Tyzzer, 1907, were present in dairy and beef cattle. These authors (Upton and Current, 1985, loc. cit.) considered C. parvum to be the causative agent in all welldocumented cases of mammalian cryptosporidiosis. Current et al. (1986, Journal of Protozoology 33: 289-296) described Cryptosporidium baileyi from chickens and considered this species responsible for causing cryptosporidiosis in chickens.
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