Of the 18 valid species of Cryptosporidium (Protozoa: Apicomplexa) from fish, reptiles, birds and mammals reported from different parts of the world, seven species are known to be emerging gastrointestinal parasites of zoonotic importance. Among the parasites, two species, C. parvum and C. andersoni are found to exist among calves in India. The first Indian report of C. parvum was in 1992, in calves from Uttar Pradesh1. Its association with diarrhoea in children of some states of India has also been established and it is becoming a growing paediatric problem.