Endemic stability for Theileria parva infections in Ankole calves of the Ankole ranching scheme, Uganda.

A population-based study was carried out on the Ankole ranching scheme in south-west Uganda with the aim of determining the endemic status of Theileria parva infections. For this purpose, the age-related sero-prevalence of T. parva and the specific calf mortality associated with the parasite were assessed.

Absence of perinatal transmission of blood-borne non-A, non-B hepatitis virus by chimpanzees with acute and chronic infection.

Two chimpanzees were born to parents with chronic non-A, non-B hepatitis and remained with their mothers until 12 and 18 months, respectively. The infants were followed from 7 to 8 weeks of age with biweekly or monthly blood samples and with monthly liver biopsies from 4 to 7 months after birth. Another chimpanzee, along with both of its parents, was held throughout the parents' acute infection with non-A, non-B hepatitis; at this time the infant was 14-16 months of age, and it was followed with bi-weekly blood samples and monthly biopsies from the time of potential exposure for 20 months.

Failure of a human immunodeficiency virus (HIV) immune globulin to protect chimpanzees against experimental challenge with HIV.

To assess the possible efficacy of passive immunization against human immunodeficiency virus (HIV) an immune globulin was prepared from plasma of HIV-seropositive donors selected to be among those having the top 12.5% of virus-neutralizing antibody titers. The immune globulin was treated with pepsin to render it intravenously tolerable.