Changes

*Wide host range

*Wide host range

*Parasitises epithelial cells lining the epithelial cells lining the ailimentary and respiratory tracts

*Parasitises epithelial cells lining the alimentary and respiratory tracts

*Developmental stages confined to the '''microvillous brish border'''

*Developmental stages confined to the '''microvillous brush border'''

*''C. parvum'' most associated with disease in domestic animals and in humans

*''C. parvum'' most associated with disease in domestic animals and in humans