ABSTRACT
Cryptosporidiosis, based on shedding of oocysts in feces, was reported in piglets in Vietnam. Initial accounts of natural infection in pigs were reported in the US in 1977 in a pig with necrotic enteritis in South Dakota and in three purebred Duroc pigs in Kansas. Clinical cryptosporidiosis in horses was reported in immunodeficient Arabian foals in the US in 1978. In 1982, piglets in New South Wales, as well as suckling and fattening pigs in the Federal Republic of Germany, and a diarrheic nursing piglet in South Dakota were reported to be infected with Cryptosporidium. The establishment of cryptosporidiosis outside the intestinal tract was accomplished by inoculating ten hysterectomy-derived 3- to 6-d-old piglets with oocysts originally isolated from a calf and concentrated by sugar flotation into the trachea and onto the conjunctival sacs. Cryptosporidiosis in immunocompetent horses was confirmed in two foals, a 1-week-old Percheron and a 6-week-old Arabian.
