PROSPECTIVE COMPARISON OF MOTHER-TO-CHILD TRANSMISSION OF HIV-1 AND HIV-2 IN ABIDJAN, IVORY-COAST

Objective.-To compare mother-to-child transmission of human immunodefi ciency virus types 1 and 2 (HIV-1 and HIV-2, respectively) and to asse ss the impact of maternal HIV-1 and HIV-2 infections on child survival . Design.-Prospective cohort study. Setting-Maternal and child health center in a lower socioeconomic class district of Abidjan, Ivory Coast . Participants.-A total of 18 099 women delivering between 1990 and 19 92 were tested for HIV-1 and HIV-2 antibodies. A cohort of 613 pregnan t women and their infants was followed prospectively (138 women reacti ve to HIV-1, 132 reactive to HIV-2, 69 reactive to both viruses, and 2 74 HIV-seronegative). Main Outcome Measures.-Rates of perinatal transm ission for HIV-1, HIV-2, and both viruses, determined from results of serological and polymerase chain reaction tests on children; survival of infants born to HIV-1-positive, HIV-2-positive, dually reactive, an d HIV-seronegative women. Results-Of the 18 099 women tested, 9.4% wer e reactive to HIV-1 alone, 1.6% to HIV-2 alone, and 1.0% to both virus es. The rate of perinatal transmission of HIV-1 was 24.7% (95% confide nce interval [Cl], 15.8% to 33.7%), compared with 1.2% (95% Cl, 0.0% t o 3.5%) for HIV-2 (relative risk, 21.3; 95% Cl, 2.9 to 154.3). Overall , 19.0% (95% Cl, 9.0% to 29.0%) of infants of dually reactive women be came infected; of the 11 children concerned, 10 were infected with HIV -1 and one with HIV-1 and HIV-2. Infants of HIV-seropositive mothers h ad a reduced survival; mortality rates were 15.1, 13.0, 6.5, and 3.4 d eaths per 100 child-years, respectively, for children of HIV-1-positiv e, dually reactive, HIV-2-positive, and HIV-seronegative women. Conclu sions-The rate of perinatal transmission of HIV-2 (1.2%) was much lowe r than the rate of perinatal transmission of HIV-1 (24.7%), and this w as associated with more favorable survival for infants of HIV-2-infect ed mothers. Dually reactive women could transmit both viruses, althoug h transmission usually involved HIV-1 only. Public health guidelines s hould incorporate advice that perinatal transmission of HIV-2 is rare.