Placental Malaria and Mother-to-Child Transmission of HIV-1 in Rural Rwanda Philip L. Bulterys, Ann Chao, Sudeb C. Dalai, M. Christine Zink, Abel Dushimimana,

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Placental Malaria and Mother-to-Child Transmission of HIV-1 in Rural Rwanda Philip L. Bulterys, Ann Chao, Sudeb C. Dalai, M. Christine Zink, Abel Dushimimana, David Katzenstein, Alfred J. Saah, Marc Bulterys IAS Rome 2011

BACKGROUND: Studies examining the relationship between placental malaria (PM) and mother-to-child transmission (MTCT) of HIV-1 have reported varying results. AIM: We aimed to determine the relationship between PM and MTCT of HIV-1 in rural Rwanda prior to antiretroviral therapy or prophylaxis. METHODS: We conducted a nested case-control study of PM and MTCT of HIV-1 within a prospective cohort of 627 mother-infant pairs followed from October April 1994 in rural Rwanda. Placentas were examined histologically for PM. Twenty transmitter pairs were compared to 20 non-transmitter pairs and 20 HIV- negative pairs.

RESULTS: Of the 60 placentas examined, 45% overall showed evidence of placental malaria. PM was associated with increased risk of MTCT of HIV-1 (aOR = 6.3; 95% CI = )*, especially among primigravidae (aOR = 12.0; 95% CI = ). 75% 35% 25%

CONCLUSIONS: Prior to the availability of antiretroviral therapy, we observed that PM was independently associated with MTCT of HIV-1 in rural Rwanda, particularly among primigravidae. Prevention and treatment of malaria among pregnant women may reduce the risk of MTCT of HIV-1. In the context of HAART during pregnancy, we speculate that the impact of PM on MTCT of HIV-1 may be limited, particularly among those with undetectable virus.

ACKNOWLEDGEMENTS: We gratefully acknowledge the participants of this study, study staff, and all contributors. This study was funded by the National Institute of Child Health and Human Development and the World AIDS Foundation. PLB is supported by the UCLA/Caltech MSTP and the Paul and Daisy Soros Fellowship for New Americans. REFERENCE: Bulterys PL, Chao A, Dalai SC, Zink MC, Dushimimana A, Katzenstein D, Saah AJ, Bulterys M. Placental malaria and mother-to-child transmission of human immunodeficiency virus-1 in rural Rwanda. American Journal of Tropical Medicine and Hygiene (August 2011).