Not to be inj. Individuals w/ malignancies or immunocompromised or those receiving immunosuppressive therapy; HIV-infected; those who have received blood transfusion or products eg, Ig w/in 42 days. Acute infection or febrile illness. Infants w/ active GI illness, chronic diarrhea, growth retardation or history of congenital abdominal disorders or intussusception. Infants <6 wk.