Although survival rates for very-low-birth-weight infants (≤ 1.5 kg) continue to increase, nosocomial infections remain a major cause of morbidity and mortality. Prolonged hospitalization with exposure to resistant organisms and multiple invasive procedures, in the presence of immunologic immaturity, renders these infants vulnerable to hospital-acquired infections. Prior studies testing the ability of intravenous immune globulin to prevent nosocomial infections in premature infants have varied in design and sample size. Despite differences in the rates of observed infection, immune globulin preparations, doses, and infusion intervals, a meta-analysis of published reports suggests that nosocomial infections may be diminished by the prophylactic infusion of IgG.