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Evaluation of the Immune Response to a 2-Dose Measles Vaccination Schedule Administered at 6 and 9 Months of Age to HIV-Infected and HIV-Uninfected Children in Malawi.

Author(s): Helfand RF, Witte D, Fowlkes A, Garcia P, Yang C, Fudzulani R, Walls L, Bae S, Strebel P, Broadhead R, Bellini WJ, Cutts F

Affiliation(s): 1Coordinating Center for Infectious Diseases, Centers for Disease Control and Prevention, Altanta, Georgia; 2College of Medicine, University of Malawi, Blantyre, Malawi; 3World Health Organization, Geneva, Switzerland; 4London School of Hygiene and Tropical Medicine, London, United Kingdom.

Publication date & source: 2008-11-15, J Infect Dis., 198(10):1457-1465.

Background. @nbsp; The World Health Organization recommends that infants at high risk for developing measles before 9 months of age, including human immunodeficiency virus (HIV)-infected infants, receive measles vaccination (MV) at 6 and 9 months of age. Methods. @nbsp; Children born to HIV-infected mothers received MV at 6 and 9 months, and children of HIV-uninfected mothers were randomized to receive MV at 6 and 9 months, MV at 9 months, or routine MV without follow-up. Blood samples were obtained before and 3 months after each MV. Data were collected on adverse events for 21 days after each MV, at all clinic visits, on any hospitalization, and for subjects who died. HIV-infection status was determined by antibody assays and polymerase chain reaction; the presence of measles IgG was determined by EIA. Results. @nbsp; Twenty-two hundred mother-infant pairs were enrolled. After the first and second doses of measles vaccine, respectively, the percentages of children who were measles seropositive were 59% (36 of 61) and 64% (29 of 45) among HIV-infected children, 68% (152 of 223) and 94% (189 of 202) among HIV-exposed but uninfected children, and 62% (288 of 467) and 92% (385 of 417) among HIV-unexposed children. Of 521 HIV-unexposed children vaccinated only at 9 months, 398 (76%) were measles seropositive at 12 months. No serious vaccine-related adverse events were identified. Conclusions. @nbsp; An early, 2-dose MV schedule was immunogenic, but a higher proportion of HIV-infected children remained susceptible to measles, compared with HIV-uninfected children (whether HIV exposed or HIV unexposed).

Page last updated: 2008-11-03

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