Abstract
Infections by Cryptosporidium were detected in association with clinical disease in 11 humans ( Homo sapiens), 19 calves ( Bos taurus), nine common quail ( Coturnix coturnix), six mallard ducks ( Anas platyrhynchos), five ring-necked pheasant ( Phasianus colchicus) and a single budgerigar ( Melopsittacus undulatus). Infections in mammals were accompanied by transient diarrhoea and anorexia, whereas infected birds exhibited clinical signs of respiratory distress. Repeated cross-transmission studies revealed apparent strain differences or differences in the host specificity of several mammalian and avian isolates for homologous vertebrate classes only. Oocysts from humans and calves were infective to mice, pigs or lambs, but not to chickens, whereas oocysts from quail and pheasant were infective to chickens, but not to mice.
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