Interference of immune globulin with measles and rubella immunization.

In recent years, immune globulins (IGs) have found increasing application in the prevention and treatment of childhood illnesses. The authors examined the hypothesis that passively acquired antibody may interfere with the active antibody response to live viral vaccines such as measles and rubella. To evaluate the duration of an inhibitory effect, the authors measured the measles and rubella antibody responses of White Mountain Apache children immunized with measles, mumps, and rubella vaccine at varying intervals after administration of an immune globulin termed bacterial polysaccharide immune globulin (BPIG). This specific immune globulin contained measles and rubella antibody titers similar to those in standard intra-muscularly and intravenously administered immune globulins. Antibody responses to measles vaccine were inhibited for up to 5 months after a BPIG dose of 80 mgIgG per kilogram of body weight, but responses to rubella vaccine were inhibited for only 2 months. Most children who had decreased measles antibody response to primary measles, mumps, and rubella immunization given 11/2 to 4 months after BPIG administration responded to booster immunization given 6 months after their last BPIG dose. The authors conclude that high doses of immune globulin (>10mg/kg) may inhibit the antibody response to measles for more than 3 months. They propose that the interval between administration of immune globulin and measles and rubella immunization be adjusted on the basis of the dose of immune globulin.