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Original Article
Volume 331:1173-1180 November 3, 1994 Number 18
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Reduction of Maternal-Infant Transmission of Human Immunodeficiency Virus Type 1 with Zidovudine Treatment
Edward M. Connor, Rhoda S. Sperling, Richard Gelber, Pavel Kiselev, Gwendolyn Scott, Mary Jo O'Sullivan, Russell VanDyke, Mohammed Bey, William Shearer, Robert L. Jacobson, Eleanor Jimenez, Edward O'Neill, Brigitte Bazin, Jean-Francois Delfraissy, Mary Culnane, Robert Coombs, Mary Elkins, Jack Moye, Pamela Stratton, James Balsley, for The Pediatric AIDS Clinical Trials Group Protocol 076 Study Group

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ABSTRACT

Background and Methods Maternal-infant transmission is the primary means by which young children become infected with human immunodeficiency virus type 1 (HIV). We conducted a randomized, double-blind, placebo-controlled trial of the efficacy and safety of zidovudine in reducing the risk of maternal-infant HIV transmission. HIV-infected pregnant women (14 to 34 weeks' gestation) with CD4+ T-lymphocyte counts above 200 cells per cubic millimeter who had not received antiretroviral therapy during the current pregnancy were enrolled. The zidovudine regimen included antepartum zidovudine (100 mg orally five times daily), intrapartum zidovudine (2 mg per kilogram of body weight given intravenously over a one-hour period, then 1 mg per kilogram per hour until delivery), and zidovudine for the newborn (2 mg per kilogram orally every six hours for six weeks). Infants with at least one positive HIV culture of peripheral-blood mononuclear cells were classified as HIV-infected.

Results From April 1991 through December 20, 1993, the cutoff date for the first interim analysis of efficacy, 477 pregnant women were enrolled; during the study period, 409 gave birth to 415 live-born infants. HIV-infection status was known for 363 births (180 in the zidovudine group and 183 in the placebo group). Thirteen infants in the zidovudine group and 40 in the placebo group were HIV-infected. The proportions infected at 18 months, as estimated by the Kaplan-Meier method, were 8.3 percent (95 percent confidence interval, 3.9 to 12.8 percent) in the zidovudine group and 25.5 percent (95 percent confidence interval, 18.4 to 32.5 percent) in the placebo group. This corresponds to a 67.5 percent (95 percent confidence interval, 40.7 to 82.1 percent) relative reduction in the risk of HIV transmission (Z = 4.03, P = 0.00006). Minimal short-term toxic effects were observed. The level of hemoglobin at birth in the infants in the zidovudine group was significantly lower than that in the infants in the placebo group. By 12 weeks of age, hemoglobin values in the two groups were similar.

Conclusions In pregnant women with mildly symptomatic HIV disease and no prior treatment with antiretroviral drugs during the pregnancy, a regimen consisting of zidovudine given ante partum and intra partum to the mother and to the newborn for six weeks reduced the risk of maternal-infant HIV transmission by approximately two thirds.


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From the Department of Pediatrics, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark (E.M.C.); Department of Obstetrics, Gynecology and Reproductive Science, Mt. Sinai School of Medicine, New York (R.S.S.); Statistical and Data Analysis Center of the AIDS Clinical Trials Group, Harvard School of Public Health and the Dana-Farber Cancer Institute, Boston (R.G., P.K.); Department of Pediatrics (G.S.) and Department of Obstetrics and Gynecology (M.J.O.), University of Miami School of Medicine, Miami; Department of Pediatrics, Tulane University School of Medicine, New Orleans (R.V.D.); Department of Obstetrics and Gynecology, Louisiana State University School of Medicine, New Orleans (M.B.); Department of Pediatrics, Baylor College of Medicine, Houston (W.S.); Department of Obstetrics and Gynecology, University of Texas School of Medicine, Houston (R.L.J.); Department of Pediatrics (E.J.) and Department of Obstetrics and Gynecology (E.O.), San Juan City Hospital, San Juan, P.R.; Agence Nationale de Recherche sur le SIDA, Paris (B.B., J.-F.D.); University of Washington School of Medicine, Seattle (R.C.); Burroughs Wellcome Company, Research Triangle Park, N.C. (M.E.); National Institute of Child Health and Human Development, Bethesda, Md. (J.M., P.S.); and Pediatric Medicine Branch, Division of AIDS, National Institute of Allergy and Infectious Diseases, Bethesda, Md. (M.C., J.B.). The members of the Pediatric AIDS Clinical Trials Group Protocol 076 Study Group are listed in the Appendix.

Address reprint requests to Dr. Connor at MedImmune, Inc., 35 W. Watkins Mill Rd., Gaithersburg, MD 20878.

Full Text of this Article


Related Letters:

Maternal –Infant Transmission of HIV-1
Mtimavalye L., Biggar R. J., Taha T. E., Chiphangwi J., Connor E., Sperling R., Gelber R. D., Balsley J.
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N Engl J Med 1995; 332:890-891, Mar 30, 1995. Correspondence

Ethical Issues in the Use of Zidovudine to Reduce Vertical Transmission of HIV
Hoffman C. A., Munson R., Thea D. M., De Roo A., Colebunders R., Bayer R.
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N Engl J Med 1995; 332:891-892, Mar 30, 1995. Correspondence

Mandatory HIV Testing for the Mentally Ill
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