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Adobe Flash Player is required to view this feature. If you are using an operating system that does not support Flash, we are working to bring you alternative formats. Original Article Prevention of HIV-1 Infection with Early Antiretroviral Therapy Myron S. Cohen, M.D., Ying Q.

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Chen, Ph.D., Marybeth McCauley, M.P.H., Theresa Gamble, Ph.D., Mina C. Hosseinipour, M.D., Nagalingeswaran Kumarasamy, M.B., B.S., James G. Hakim, M.D., Johnstone Kumwenda, F.R.C.P., Beatriz Grinsztejn, M.D., Jose H.S. Pilotto, M.D., Sheela V. Godbole, M.D., Sanjay Mehendale, M.D., Suwat Chariyalertsak, M.D., Breno R. Santos, M.D., Kenneth H.

Mayer, M.D., Irving F. Hoffman, P.A., Susan H. Eshleman, M.D., Estelle Piwowar-Manning, M.T., Lei Wang, Ph.D., Joseph Makhema, F.R.C.P., Lisa A. Mills, M.D., Guy de Bruyn, M.B., B.Ch., Ian Sanne, M.B., B.Ch., Joseph Eron, M.D., Joel Gallant, M.D., Diane Havlir, M.D., Susan Swindells, M.B., B.S., Heather Ribaudo, Ph.D., Vanessa Elharrar, M.D., David Burns, M.D., Taha E. Taha, M.B., B.S., Karin Nielsen-Saines, M.D., David Celentano, Sc.D., Max Essex, D.V.M., and Thomas R. Fleming, Ph.D., for the HPTN 052 Study Team N Engl J Med 2011; 365:493-505 DOI: 10. Marathi Kalnirnay 2009 Pdf Free Download. 1056/NEJMoa1105243.

Methods In nine countries, we enrolled 1763 couples in which one partner was HIV-1–positive and the other was HIV-1–negative; 54% of the subjects were from Africa, and 50% of infected partners were men. HIV-1–infected subjects with CD4 counts between 350 and 550 cells per cubic millimeter were randomly assigned in a 1:1 ratio to receive antiretroviral therapy either immediately (early therapy) or after a decline in the CD4 count or the onset of HIV-1–related symptoms (delayed therapy). The primary prevention end point was linked HIV-1 transmission in HIV-1–negative partners. The primary clinical end point was the earliest occurrence of pulmonary tuberculosis, severe bacterial infection, a World Health Organization stage 4 event, or death. Results As of February 21, 2011, a total of 39 HIV-1 transmissions were observed (incidence rate, 1.2 per 100 person-years; 95% confidence interval [CI], 0.9 to 1.7); of these, 28 were virologically linked to the infected partner (incidence rate, 0.9 per 100 person-years, 95% CI, 0.6 to 1.3). Of the 28 linked transmissions, only 1 occurred in the early-therapy group (hazard ratio, 0.04; 95% CI, 0.01 to 0.27; P. Combination antiretroviral therapy decreases the replication of human immunodeficiency virus type 1 (HIV-1) and improves the survival of infected persons.

Such therapy has been shown to reduce the amount of HIV-1 in genital secretions. Because the sexual transmission of HIV-1 from infected persons to their partners is strongly correlated with concentrations of HIV-1 in blood and in the genital tract, it has been hypothesized that antiretroviral therapy could reduce sexual transmission of the virus. Several observational studies have reported decreased acquisition of HIV-1 by sexual partners of patients receiving antiretroviral therapy. These results have been extrapolated to suggest that the use of early antiretroviral therapy could reduce the spread of the virus in a population. Some ecologic studies have shown a reduction in the incidence of new cases of HIV-1 after expanded use of antiretroviral therapy.

The effect of the timing of the initiation of antiretroviral therapy on clinical and microbiologic outcomes has been controversial in evaluations of the benefit of therapy and of the associated short- and long-term complications and costs. For many years, antiretroviral therapy was delayed until a patient's CD4 count fell below 200 cells per cubic millimeter, which led to frequent opportunistic infections. Retrospective analyses of patients with HIV-1 infection who were treated in developed countries have suggested a benefit from early antiretroviral therapy, although the ability to control for bias in these studies has limits.

To evaluate the effect of combination antiretroviral therapy on the prevention of HIV-1 transmission to uninfected partners and on clinical events in infected persons, the HIV Prevention Trials Network (HPTN) conducted a multicontinent, randomized, controlled trial, called HPTN 052, to compare early versus delayed antiretroviral therapy for patients with HIV-1 infection who had CD4 counts between 350 and 550 cells per cubic millimeter and who were in a stable sexual relationship with a partner who was not infected. Study Population We enrolled HIV-1 serodiscordant couples at 13 sites in 9 countries (Gaborone, Botswana; Kisumu, Kenya; Lilongwe and Blantyre, Malawi; Johannesburg and Soweto, South Africa; Harare, Zimbabwe; Rio de Janeiro and Porto Alegre, Brazil; Pune and Chennai, India; Chiang Mai, Thailand; and Boston). A pilot phase started in April 2005, and enrollment took place from June 2007 through May 2010. Couples were required to have had a stable relationship for at least 3 months, to have reported three or more episodes of vaginal or anal intercourse during this time, and to be willing to disclose their HIV-1 status to their partner. Patients with HIV-1 infection were eligible if their CD4 count was between 350 and 550 cells per cubic millimeter and they had received no previous antiretroviral therapy except for short-term prevention of mother-to-child transmission of HIV-1.

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(Full criteria for inclusion and exclusion are provided in the, available with the full text of this article at The study, which is also available at, was approved by at least one local institutional review board affiliated with each site, by boards affiliated with collaborating organizations, and by other local regulatory bodies when appropriate (for details, see the ). All study participants provided written informed consent in their local languages, or English, if preferred.

Study Oversight The study was funded by the National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health, which assumed all sponsor responsibilities through an investigational new drug application with the Food and Drug Administration (FDA). The antiviral agents that were used in the study were donated by pharmaceutical companies, which were not involved in the design or management of the study. All authors vouch for the completeness and accuracy of the data presented, as well as the fidelity of the report to the study protocol. Study Design HIV-1 serodiscordant couples were randomly assigned in a 1:1 ratio to either an early or delayed strategy for receipt of antiretroviral therapy. Permuted-block randomization was used with stratification according to site.

In the early-therapy group, antiretroviral therapy was initiated in the partner with HIV-1 infection at enrollment. In the delayed-therapy group, therapy was initiated after two consecutive measurements in which the CD4 count was 250 cells per cubic millimeter or less or after the development of an illness related to the acquired immunodeficiency syndrome (AIDS). HIV-1–infected participants who had active tuberculosis were excluded, and isoniazid prophylaxis was available, according to local guidelines and practice standards. After enrollment, study participants were asked to attend three monthly visits, which were followed by quarterly visits unless they became ill or needed additional antiretroviral medications. HIV-1–infected participants who were receiving antiretroviral therapy had one additional visit 2 weeks after starting therapy. HIV-1–uninfected partners were encouraged to return for all visits together for counseling on risk reduction and the use of condoms, for treatment of sexually transmitted infections, and for management of other medical conditions. Some HIV-1–infected participants received trimethoprim–sulfamethoxazole prophylaxis, according to local guidelines.

HIV-1–uninfected partners were tested for HIV-1 seroconversion on a quarterly basis. Samples from all seroconversion events were evaluated at a central laboratory, and results were reviewed by an independent HIV end-point committee. Partners with seroconversion were released from the study and referred to a prearranged local clinic for care. After the initiation of antiretroviral therapy, virologic failure for HIV-1–infected participants was defined as two consecutive plasma HIV-1 RNA measurements of more than 1000 copies per milliliter at 16 weeks or later.

Assessment for clinical signs and symptoms, laboratory measurements, interviews about sexual behavior, review of adherence to the antiretroviral regimen (including a self-reported questionnaire and pill counts), and adherence counseling were conducted at each visit. (Details regarding study procedures, including guidelines for adherence counseling, are provided in the.) Any woman who was pregnant at enrollment or became pregnant was provided antiretroviral therapy appropriate for use during pregnancy at the start of the second trimester.

On the basis of the judgment of the site investigator, women in the delayed-therapy group discontinued antiretroviral therapy after delivery or when breast-feeding ended. A new partner could be enrolled with an HIV-1–infected participant if the original partner was released from the study and the new HIV-1–uninfected partner met all inclusion or exclusion criteria. Antiretroviral Drugs Study drugs included a combination of lamivudine and zidovudine (Combivir), efavirenz, atazanavir, nevirapine, tenofovir, lamivudine, zidovudine, didanosine, stavudine, a combination of lopinavir and ritonavir (Kaletra and Aluvia), ritonavir, and a combination of emtricitabine and tenofovir (Truvada). A prespecified combination of these drugs was provided to participants at monthly or quarterly visits. Sites could also use locally supplied, FDA-approved drugs if they could be purchased with nonstudy funds.

For participants with virologic failure, specified second-line treatment regimens were provided. Assessment of Linkage of Seroconversions To assess whether seroconversions were linked, HIV-1 pol gene sequences were generated by population sequencing for study-partner pairs and for 10 additional HIV-infected local control subjects for each relevant site. Sequences were analyzed with the use of phylogenetic methods. The probability of linkage was also assessed with the use of Bayes' theorem to compare the genetic similarity of HIV-1 from partner pairs with the genetic similarity of HIV-1 from local control subjects. In some cases, HIV-1 samples from partner pairs were analyzed with the use of ultra-deep pyrosequencing of the gp41 region. Statistical Analysis We determined that an enrollment of 1750 serodiscordant couples would provide a power of at least 87% to detect a 39% reduction in the incidence of HIV-1 transmission to uninfected partners in the early-therapy group, as compared with the delayed-therapy group (primary prevention end point).

By the end of the trial, we anticipated a total of 188 transmission incidences, with cumulative incidence rates of 8.3% in the early-therapy group and 13.2% in the delayed-therapy group, for a total duration of 6.5 years, with an accrual period of 1.5 years and a 5% annual loss to follow-up. The sample size of 1750 would also provide a power of 92% to show that early initiation of antiretroviral therapy provided at least a 20% reduction in the rate of serious clinical events associated with HIV-1 infection, which included death, a World Health Organization (WHO) stage 4 event, or a severe bacterial infection or pulmonary tuberculosis (primary clinical end point). By the end of the trial, we anticipated a total of 234 such clinical events, with cumulative incidence rates of 8.7% in the early-therapy group and 18.0% in the delayed-therapy group. The study was reviewed twice each year by an independent NIAID multinational data and safety monitoring board.

To guide the board in its recommendations regarding trial continuation, a composite monitoring end point was developed to include the occurrence of either death or WHO stage 4 events (excluding esophageal candidiasis) in HIV-1–infected participants or the transmission of HIV-1 to uninfected partners, whichever occurred first in the discordant couple. These were the events that were considered to have the greatest clinical effect on both the HIV-1–infected participant and the uninfected partner. A Lan–DeMets implementation of an O'Brien–Fleming monitoring boundary was used to evaluate the interim data with respect to this composite end point. An early termination would be indicated if there were conclusive evidence to rule out a hazard ratio of 0.80 or more in the early-therapy group. Interim analyses were planned when approximately 25%, 50%, 75%, and 100% of a total 340 composite events were observed. We used the Kaplan–Meier method to calculate event-free probabilities and person-year analysis for incidence rate for a given year.

We also used Cox regression to estimate relative risks, which were expressed as hazard ratios and 95% confidence intervals, and to provide adjustment for potential prognostic factors, such as the infected participant's baseline CD4 count, baseline plasma HIV-1 RNA concentration, and sex. The same Cox analyses were performed on linked transmissions, any transmissions, clinical events, and composite monitoring events. We used chi-square tests to compare the frequencies of adverse events. A P value of less than 0.05 was considered to indicate statistical significance. The cutoff was adjusted for multiple comparisons in trial-monitoring boundaries. Study Participants A total of 10,838 persons were screened in order to enroll 1763 HIV-1–serodiscordant couples; 886 couples were randomly assigned to the early-therapy group and 877 to the delayed-therapy group) ( Figure 1 Enrollment and Outcomes.

This trial profile describes recruitment of couples from the general population, randomization, HIV-1–uninfected partner's enrollment, seroconversion at baseline, retention, and loss-to-follow-up for assessment of the primary end point of linked HIV-1 transmission. Enrolled partners were followed on a quarterly-visit schedule, although attendance at semiannual visits is shown., and the ). Twelve additional HIV-1–uninfected partners were enrolled as the result of a new relationship. The majority of couples (97%) were heterosexual, and 94% were married; 50% of HIV-1–infected participants were men. The majority of participants (61%) were between 26 and 40 years of age.

At enrollment, 1291 of HIV-1–infected participants (73%) and 1281 of HIV-1–uninfected partners (72%) reported having had at least one sexual encounter during the previous week. During the same period, 5% and 6%, respectively, reported having unprotected sex. The median CD4 counts for the HIV-1–infected partners were 442 cells per cubic millimeter in the early-therapy group and 428 cells per cubic millimeter in the delayed-therapy group.

The median log 10 plasma viral load was 4.4 in each study group. Participants in the two study groups were similar in educational status, self-reported sexual behavior, and rate of condom use ( Table 1 Baseline Characteristics of the Participants. At enrollment, less than 5% of participants had a sexually transmitted infection, and rates and types of infection were similar in the two study groups (see the ). A total of 84 of 449 HIV-uninfected male partners (19%) in the early-therapy group and 64 of 460 (14%) in the delayed-therapy group had been circumcised (P=0.05). New sexually transmitted infections were detected with similar frequency among participants in the early-therapy group and the delayed-therapy group during the study, with 36 and 34 syphilis infections, 6 and 8 gonorrhea infections, 10 and 11 chlamydia infections, and 22 and 19 trichomonas infections, respectively. Among HIV-1–infected participants, a mean of 96% of those in the early-therapy group and 95% of those in the delayed-therapy group reported 100% condom use during the study. On April 28, 2011, the data and safety monitoring board recommended that the results of the study be released on the basis of data collection through February 21, 2011.

At that time, 90% of couples remained enrolled in the study, with a median follow-up of 1.7 years; the total number of person-years of follow-up was 1585 in the early-therapy group and 1567 in the delayed-therapy group. The expected effect of early versus delayed antiretroviral therapy on log 10 plasma viral load and CD4 counts in the HIV-1–infected participants was observed shortly after enrollment. By 3 months after randomization, 89% of the participants in the early-therapy group had a plasma viral load of less than 400 copies per milliliter, as compared with 9% in the delayed-therapy group. CD4 counts in the early-therapy group rose after the initiation of antiretroviral therapy, from a median of 442 cells per cubic millimeter at enrollment to 603 cells per cubic millimeter by 12 months, and the counts continued to rise throughout the follow-up period (see the ). A modest decline in CD4 counts was observed in the delayed-therapy group, from a median of 428 cells per cubic millimeter at enrollment to 399 cells per cubic millimeter by 12 months.

A total of 21% of HIV-1–infected participants in the delayed-therapy group began taking antiretroviral therapy after a median of 42 months. Among all participants, 72% received a combination of zidovudine, lamivudine, and efavirenz (see the ). Adherence to the study regimen of at least 95% (as measured by pill count) was observed in 79% of participants in the early-therapy group and in 74% of those in the delayed-therapy group. Details with respect to regimens of antiretroviral therapy and pill counts are provided in the. Virologic failure was observed in 45 of 886 participants (5%) in the early-therapy group and in 5 of 184 participants in the delayed-therapy group who initiated antiretroviral therapy (3%) (P=0.23). Of all treated participants, 66% initiated a second-line regimen. Primary Prevention Outcome A total of 39 HIV-1 transmission events were observed (incidence rate, 1.2 per 100 person-years; 95% confidence interval [CI], 0.9 to 1.7), with 4 events in the early-therapy group (incidence rate, 0.3 per 100 person-years; 95% CI, 0.1 to 0.6) and 35 events in the delayed-therapy group (incidence rate, 2.2 per 100 person-years; 95% CI, 1.6 to 3.1), for a hazard ratio in the early-therapy group of 0.11 (95% CI, 0.04 to 0.32; P.

Primary Treatment Outcome A total of 105 treatment end points, as measured by the first serious HIV-1–related clinical event or death, were observed in HIV-1–infected participants: 40 in the early-therapy group and 65 in the delayed-therapy group (hazard ratio, 0.59; 95% CI, 0.40 to 0.88; P=0.01 (, and the ). Of such clinical events, 44% occurred in Asia and 45% in Africa. The baseline plasma viral load was an important predictor of clinical events, as assessed on multivariate analysis ( ). In the stratified multivariate model, the adjusted hazard ratio for clinical events in the early-therapy group was 0.59 (95% CI, 0.40 to 0.89). The difference in the rate of clinical events appeared to be driven mainly by the incidence of extrapulmonary tuberculosis, which developed in 3 participants in the early-therapy group and 17 in the delayed-therapy group (P=0.002); of these cases, 55% were observed in India. Pulmonary tuberculosis was observed in 13 participants in the early-therapy group and 15 in the delayed-therapy group; isoniazid prophylaxis was administered to only 4% of participants in each study group. There were 23 deaths during the course of the study, 10 in the early-therapy group and 13 in the delayed-therapy group (hazard ratio, 0.77; 95% CI, 0.34 to 1.76; P=0.27) (for details regarding causes of death, see the ).

Composite Monitoring Events Among 102 composite monitoring events, there were 39 transmission events in which the sexual partner acquired HIV-1. Among HIV-1–infected participants, 21 died and 42 had WHO stage 4 clinical events.

Of these monitoring events, 58 (57%) occurred in Africa, 31 (30%) in Asia, and 13 (13%) in the Americas. Overall, 23 monitoring events were observed in the early-therapy group and 79 in the delayed-therapy group (hazard ratio, 0.28; 95% CI, 0.18 to 0.45; P. Adverse Events After the exclusion of primary clinical end points (death, WHO stage 4 events, pulmonary tuberculosis, and severe bacterial infections), 246 HIV-1–infected participants had one or more severe or life-threatening adverse events (grade 3 or 4): 127 of 886 (14%) were in the early-therapy group and 119 of 877 (14%) were in the delayed-therapy group (P=0.64). The most frequently reported adverse events included infections, psychiatric and nervous system disorders, metabolism and nutrition disorders, and gastrointestinal disorders (for details, see the ). Grade 3 or 4 laboratory abnormalities during study follow-up occurred in 242 participants (27%) in the early-therapy group and 161 participants (18%) in the delayed-therapy group (P.

Discussion In this study involving 1763 serodiscordant couples in which HIV-1–infected participants had a CD4 count of 350 to 550 cells per cubic millimeter, there was a relative reduction of 96% in the number of linked HIV-1 transmissions resulting from the early initiation of antiretroviral therapy, as compared with delayed therapy. There was a relative reduction of 89% in the total number of HIV-1 transmissions resulting from the early initiation of antiretroviral therapy, regardless of viral linkage with the infected partner. The sustained suppression of HIV-1 in genital secretions resulting from antiretroviral therapy is the most likely mechanism for the prevention of HIV-1 transmission that we observed.

The majority of HIV-1 transmissions (82%) were observed in Africa. This result reflects not only the large number of study participants who were enrolled in this region (54%) but also other factors that increase the probability of HIV-1 transmission among African couples. Several groups have reported higher viral loads in patients with HIV-1 infection in sub-Saharan Africa than in patients in developed countries. Clade C HIV-1, the dominant type in southern Africa, may have other transmission advantages as well. More frequent sexual encounters and limited condom use would also favor increased HIV transmission among African couples, possibilities that are being evaluated. Although HIV-1 transmission from patients with acute and early HIV-1 infection and advanced HIV-1 disease and the acquired immunodeficiency syndrome (AIDS) appears to be most efficient, the results from this and other studies emphasize that HIV-1 can be transmitted from infected persons who are asymptomatic or minimally symptomatic and who have high CD4 counts.

Since most persons with established HIV-1 infection fall into the latter category, such transmission, albeit not maximally efficient, must help fuel the spread of HIV-1. Early antiretroviral therapy was associated with a relative reduction of 41% in the number of HIV-1–related clinical events, which suggests a clinical benefit for the initiation of antiretroviral therapy when a person has a CD4 count of 350 to 550 cells per cubic millimeter, as compared with therapy that is delayed until the CD4 count falls into the range of 200 to 250 cells per cubic millimeter. In contrast to a recent trial comparing the effect of the initiation of therapy in patients with a CD4 count ranging from 200 to 350 cells per cubic millimeter with those with a count below 200 cells per cubic millimeter, we did not detect a significant between-group difference in overall mortality.

Despite our relatively short follow-up period, the magnitude of the clinical effect we observed was similar to that seen in observational studies conducted in the developed world. The difference between the early-therapy group and the delayed-therapy group was driven largely by the diagnosis of extrapulmonary tuberculosis, with the majority of these cases occurring in India. The use of isoniazid prophylaxis, although recommended by the WHO for patients with HIV-1 infection, was infrequently prescribed for participants in this study. In addition, data from observational studies focusing on HIV-1–related and non–HIV-1–related clinical events and CD4 counts have led to the hypothesis that delayed antiretroviral therapy could ultimately lead to an increased rate of clinical events, regardless of subsequent therapy. However, we cannot evaluate this possibility without a longer period of follow-up. We noted more adverse events in the early-therapy group than in the delayed-therapy group, including more adverse events related to antiretroviral therapy.

The clinical importance of the laboratory abnormalities that were responsible for this difference is unclear. Further examination of these data and additional longitudinal follow-up will be important to better understand the clinical and public health benefits of early antiretroviral therapy, as compared with drug costs and side effects. Our study has several limitations. In order to examine the effects of antiretroviral therapy on HIV-1 transmission, we studied stable HIV-1–discordant couples, who may not be entirely representative of the general population. We provided ongoing couples counseling and condoms, which probably contributed to the low incidence of HIV-1 infection, as previously reported. Some participants received trimethoprim–sulfamethoxazole and isoniazid prophylaxis at the discretion of the investigators, which could have reduced the degree of benefit observed with early antiretroviral therapy.

In conclusion, the biologic plausibility of the use of antiretroviral therapy for the prevention of HIV-1 infection has been carefully examined during the past two decades. The idea of HIV-1 treatment as prevention has garnered tremendous interest and hope and inspired a series of population-level HIV-1 treatment-as-prevention studies that are now in the pilot or planning stages. Such interventions are based on the hypothesis that the use of antiretroviral therapy reliably prevents HIV-1 transmission over an extended period of time. In this trial, we found that early antiretroviral therapy had a clinical benefit for both HIV-1–infected persons and their uninfected sexual partners. These results support the use of antiretroviral treatment as a part of a public health strategy to reduce the spread of HIV-1 infection. Supported by the HIV Prevention Trials Network (HPTN) and by grants (UM1-AI068619 and U01-AI068619; UM1-AI068613 and U01-AI068613, to the HPTN Network Laboratory; and UM1-AI068617 and U01-AI068617, to the HPTN Statistical and Data Management Center) from the National Institute of Allergy and Infectious Diseases. Study drugs were donated by Abbott Laboratories, Boehringer Ingelheim, Bristol-Myers Squibb, Gilead Sciences, GlaxoSmithKline/ViiV Healthcare, and Merck.

Hosseinipour reports receiving lecture fees from Abbott Virology; Dr. Eshleman, consulting fees from Roche Diagnostics, lecture fees and samples or laboratory reagents from Abbott Diagnostics and Celera Diagnostics, and lecture fees from Monogram Biosciences; Dr. Mills, grant support from GlaxoSmithKline; Dr.

De Bruyn, travel support from Sanofi Pasteur; Dr. Eron, consulting fees and grant support from Merck, Bristol-Myers Squibb, GlaxoSmithKline, and ViiV Healthcare, consulting fees from Gilead Sciences and Tibotec, and lecture fees from Bristol-Myers Squibb and Roche; Dr. Gallant, consulting fees from Abbott Laboratories, Bristol-Myers Squibb, Gilead Sciences, Merck, Tibotec Therapeutics, ViiV Healthcare, GlaxoSmithKline, Pfizer, Sangamo BioSciences, and Koronis, grant support and travel support from Gilead Sciences, and lecture fees from Monogram Biosciences; Dr. Havlir, study drug from Abbott; and Dr. Swindells, consulting fees from Gilead Sciences and Abbott Diagnostics and grant support from Pfizer, GlaxoSmithKline, and Bristol-Myers Squibb. Provided by the authors are available with the full text of this article at No other potential conflict of interest relevant to this article was reported.

This article (10.1056/NEJMoa1105243) was published on July 18, 2011, at We thank Drs.

Wafaa El-Sadr, Quarraisha Abdool Karim, and Ward Cates for their help in the preparation of the manuscript. References • 1 Ray M, Logan R, Sterne JA, et al. The effect of combined antiretroviral therapy on the overall mortality of HIV-infected individuals. AIDS 2010;24:123-137 • 2 Braitstein P, Brinkhof MW, Dabis F, et al. Mortality of HIV-1-infected patients in the first year of antiretroviral therapy: comparison between low-income and high-income countries. Lancet 2006;367:817-824[Erratum, Lancet 2006;367:1902.] • 3 Cohen MS, Gay CL.

Treatment to prevent transmission of HIV-1. Clin Infect Dis 2010;50:Suppl 3:S85-S95 • 4 Graham SM, Holte SE, Peshu NM, et al. Initiation of antiretroviral therapy leads to a rapid decline in cervical and vaginal HIV-1 shedding. AIDS 2007;21:501-507 • 5 Vernazza PL, Troiani L, Flepp MJ, et al.

Potent antiretroviral treatment of HIV infection results in suppression of the seminal shedding of HIV. AIDS 2000;14:117-121 • 6 Quinn TC, Wawer MJ, Sewankambo N, et al. Viral load and heterosexual transmission of human immunodeficiency virus type 1. N Engl J Med 2000;342:921-929 • 7 Baeten JM, Kahle E, Lingappa JR, et al. Genital HIV-1 RNA predicts risk of heterosexual HIV-1 transmission.

Sci Transl Med 2011;3:77ra29-77ra29 • 8 Bunnell R, Ekwaru JP, Solberg P, et al. Changes in sexual behavior and risk of HIV transmission after antiretroviral therapy and prevention interventions in rural Uganda. AIDS 2006;20:85-92 • 9 Donnell D, Baeten JM, Kiarie J, et al. Heterosexual HIV-1 transm.

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