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HIV transmission. Selection bias at the heterosexual HIV-1 transmission bottleneck.

ABSTRACT: Heterosexual transmission of HIV-1 typically results in one genetic variant establishing systemic infection. We compared, for 137 linked transmission pairs, the amino acid sequences encoded by non-envelope genes of viruses in both partners and demonstrate a selection bias for transmission of residues that are predicted to confer increased in vivo fitness on viruses in the newly infected, immunologically naïve recipient. Although tempered by transmission risk factors, such as donor viral load, genital inflammation, and recipient gender, this selection bias provides an overall transmission advantage for viral quasispecies that are dominated by viruses with high in vivo fitness. Thus, preventative or therapeutic approaches that even marginally reduce viral fitness may lower the overall transmission rates and offer long-term benefits even upon successful transmission.

SUBMITTER: Carlson JM

PROVIDER: S-EPMC4289910 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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HIV transmission. Selection bias at the heterosexual HIV-1 transmission bottleneck.

Carlson Jonathan M JM Schaefer Malinda M Monaco Daniela C DC Batorsky Rebecca R Claiborne Daniel T DT Prince Jessica J Deymier Martin J MJ Ende Zachary S ZS Klatt Nichole R NR DeZiel Charles E CE Lin Tien-Ho TH Peng Jian J Seese Aaron M AM Shapiro Roger R Frater John J Ndung'u Thumbi T Tang Jianming J Goepfert Paul P Gilmour Jill J Price Matt A MA Kilembe William W Heckerman David D Goulder Philip J R PJ Allen Todd M TM Allen Susan S Hunter Eric E

Science (New York, N.Y.) 20140710 6193

Heterosexual transmission of HIV-1 typically results in one genetic variant establishing systemic infection. We compared, for 137 linked transmission pairs, the amino acid sequences encoded by non-envelope genes of viruses in both partners and demonstrate a selection bias for transmission of residues that are predicted to confer increased in vivo fitness on viruses in the newly infected, immunologically naïve recipient. Although tempered by transmission risk factors, such as donor viral load, ge ...[more]

PMID: 25013080

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Project description:BackgroundTargeted interventions (TIs) have been a major strategy for HIV prevention in India. We evaluated the impact of TIs on HIV prevalence in high HIV prevalence southern states (Tamil Nadu, Karnataka, Andhra Pradesh and Maharashtra).MethodsA quasi-experimental approach was used to retrospectively compare changes in HIV prevalence according to the intensity of targeted intervention implementation. Condom gap (number of condoms required minus condoms supplied by TIs) was used as an indicator of TI intensity. Annual average number of commercial sex acts per female sex worker (FSW) reported in Behavioral Surveillance Survey was multiplied by the estimated number of FSWs in each district to calculate annual requirement of condoms in the district. Data of condoms supplied by TIs from 1995 to 2008 was obtained from program records. Districts in each state were ranked into quartiles based on the TI intensity. Primary data of HIV Sentinel Surveillance was analyzed to calculate HIV prevalence reductions in each successive year taking 2001 as reference year according to the quartiles of TI intensity districts using generalized linear model with logit link and binomial distribution after adjusting for age, education, and place of residence (urban or rural).ResultsIn the high HIV prevalence southern states, the number of TI projects for FSWs increased from 5 to 310 between 1995 and 2008. In high TI intensity quartile districts (n = 30), 186 condoms per FSW/year were distributed through TIs as compared to 45 condoms/FSW/year in the low TI intensity districts (n = 29). Behavioral surveillance indicated significant rise in condom use from 2001 to 2009. Among FSWs consistent condom use with last paying clients increased from 58.6% to 83.7% (p < 0.001), and among men of reproductive age, the condom use during sex with non-regular partner increased from 51.7% to 68.6% (p < 0.001). A significant decline in HIV and syphilis prevalence has occurred in high prevalence southern states among FSWs and young antenatal women. Among young (15-24 years) antenatal clinic attendees significant decline was observed in HIV prevalence from 2001 to 2008 (OR = 0.42, 95% CI 0.28-0.62) in high TI intensity districts whereas in low TI intensity districts the change was not significant (OR = 1.01, 95% CI 0.67-1.5).ConclusionTargeted interventions are associated with HIV prevalence decline.

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HIV transmission. Selection bias at the heterosexual HIV-1 transmission bottleneck.

Publications

HIV transmission. Selection bias at the heterosexual HIV-1 transmission bottleneck.

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