Viral Load and Heterosexual Transmission of Human Immunodeficiency Virus Type 1
Thomas C. Quinn, M.D., Maria J. Wawer, M.D., Nelson Sewankambo, M.B., David Serwadda, M.B., Chuanjun Li, M.D., Fred Wabwire-Mangen, Ph.D., Mary O. Meehan, B.S., Thomas Lutalo, M.A., Ronald H. Gray, M.D., for The Rakai Project Study Group
Background and Methods We examined the influence of viral loadin relation to other risk factors for the heterosexual transmissionof human immunodeficiency virus type 1 (HIV-1). In a community-basedstudy of 15,127 persons in a rural district of Uganda, we identified415 couples in which one partner was HIV-1positive andone was initially HIV-1negative and followed them prospectivelyfor up to 30 months. The incidence of HIV-1 infection per 100person-years among the initially seronegative partners was examinedin relation to behavioral and biologic variables.
Results The male partner was HIV-1positive in 228 couples,and the female partner was HIV-1positive in 187 couples.Ninety of the 415 initially HIV-1negative partners seroconverted(incidence, 11.8 per 100 person-years). The rate of male-to-femaletransmission was not significantly different from the rate offemale-to-male transmission (12.0 per 100 person-years vs. 11.6per 100 person-years). The incidence of seroconversion was highestamong the partners who were 15 to 19 years of age (15.3 per100 person-years). The incidence was 16.7 per 100 person-yearsamong 137 uncircumcised male partners, whereas there were noseroconversions among the 50 circumcised male partners (P<0.001).The mean serum HIV-1 RNA level was significantly higher amongHIV-1positive subjects whose partners seroconverted thanamong those whose partners did not seroconvert (90,254 copiesper milliliter vs. 38,029 copies per milliliter, P=0.01). Therewere no instances of transmission among the 51 subjects withserum HIV-1 RNA levels of less than 1500 copies per milliliter;there was a significant doseresponse relation of increasedtransmission with increasing viral load. In multivariate analysesof log-transformed HIV-1 RNA levels, each log increment in theviral load was associated with a rate ratio of 2.45 for seroconversion(95 percent confidence interval, 1.85 to 3.26).
Conclusions The viral load is the chief predictor of the riskof heterosexual transmission of HIV-1, and transmission is rareamong persons with levels of less than 1500 copies of HIV-1RNA per milliliter.
Source Information
From the National Institute of Allergy and Infectious Diseases, Bethesda, Md. (T.C.Q.); Johns Hopkins University, Baltimore (T.C.Q., C.L., R.H.G.); Columbia University, New York (M.J.W., M.O.M.); and the Faculty of Medicine, Makerere University, Kampala, Uganda (N.S., D.S., F.W.-M., T.L.).
Address reprint requests to Dr. Quinn at the Division of Infectious Diseases, Johns Hopkins University, 720 Rutland Ave., Ross 1159, Baltimore, MD 21205-2196.
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Kebaabetswe, P, Lockman, S, Mogwe, S, Mandevu, R, Thior, I, Essex, M, Shapiro, R L
(2003). Male circumcision: an acceptable strategy for HIV prevention in Botswana. Sex. Transm. Infect.
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Ahdieh-Grant, L., Yamashita, T. E., Phair, J. P., Detels, R., Wolinsky, S. M., Margolick, J. B., Rinaldo, C. R., Jacobson, L. P.
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Montefiori, D. C., Altfeld, M., Lee, P. K., Bilska, M., Zhou, J., Johnston, M. N., Gao, F., Walker, B. D., Rosenberg, E. S.
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Andreoletti, L., Gresenguet, G., Chomont, N., Matta, M., Quiniou, Y., Si-Mohamed, A., Belec, L.
(2003). Comparison of Washing and Swabbing Procedures for Collecting Genital Fluids To Assess Shedding of Human Immunodeficiency Virus Type 1 (HIV-1) RNA in Asymptomatic HIV-1-Infected Women. J. Clin. Microbiol.
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