Cryptosporidiosis in Idaho lambs: natural and experimental infections.

Cryptosporidiosis was diagnosed in lambs of a farm flock and an orphan-lamb rearing operation and in a hospitalized lamb. The clinical course was brief, with mild diarrhea and oocyst shedding during the diarrheic episode. Feces from the hospitalized lamb were used to reproduce the disease. Diarrhea and oocyst shedding occurred in inoculated lambs and their contact twin siblings but not in uninoculated noncontact control lambs or in inoculated ewes.