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Altered vaginal microbiota are associated with perinatal mother-to-child transmission of HIV in African women from Burkina Faso.

ABSTRACT: BACKGROUND:Mother-to-child transmission (MTCT) of HIV remains a significant problem in resource-limited settings, despite the advent of antiretroviral therapies. Because perturbations in vaginal microbial communities are associated with sexual transmission of HIV, we determined whether perinatal MTCT is associated with the vaginal microbiotas of HIV-infected mothers. METHODS:We conducted a retrospective analysis of cervicovaginal microbiotas by pyrosequencing of bacterial 16S rRNA genes (median 350 sequences per sample) from 10 transmitters and 54 nontransmitters during a perinatal MTCT prevention clinical trial of azidothymidine and the microbicide benzalkonium chloride. Logistic regression was performed adjusting for multiple covariates, including CD4(+) T-cell numbers and treatment group, to correlate abundances of microbial taxa with perinatal MTCT. RESULTS:The vaginal microbiotas of these subjects were dominated by several lactobacilli species, although a subset of subjects was colonized by diverse anaerobic species. MTCT of HIV was associated with significantly greater relative abundances of several groups of microorganisms. Most notably, among the abundant bacterial species, Gardnerella vaginalis was significantly enriched in cases of antepartum transmission, compared with nontransmission (odds ratio 1.7; P = 0.004). Neither azidothymidine nor benzalkonium chloride treatment was associated with shifts in microbial distributions compared with the placebo control group. CONCLUSIONS:These data suggest that alterations in vaginal microbial communities are associated with an increased risk for perinatal MTCT, consistent with results with horizontal transmission of HIV. Therefore, determining the mucosal features associated with alterations in vaginal microbial communities may guide efforts to modulate the risk for HIV MTCT.

SUBMITTER: Frank DN

PROVIDER: S-EPMC6384121 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature

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Altered vaginal microbiota are associated with perinatal mother-to-child transmission of HIV in African women from Burkina Faso.

Frank Daniel N DN Manigart Olivier O Leroy Valériane V Meda Nicolas N Valéa Diane D Zhang Weiming W Dabis François F Pace Norman R NR Van de Perre Philippe P Janoff Edward N EN

Journal of acquired immune deficiency syndromes (1999) 20120701 3

<h4>Background</h4>Mother-to-child transmission (MTCT) of HIV remains a significant problem in resource-limited settings, despite the advent of antiretroviral therapies. Because perturbations in vaginal microbial communities are associated with sexual transmission of HIV, we determined whether perinatal MTCT is associated with the vaginal microbiotas of HIV-infected mothers.<h4>Methods</h4>We conducted a retrospective analysis of cervicovaginal microbiotas by pyrosequencing of bacterial 16S rRNA ...[more]

PMID: 22343176

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Project description:IntroductionMen can play crucial roles at each stage of HIV mother-to-child-transmission (MTCT) prevention. Low male involvement in preventative MTCT (PMTCT) in Burkina Faso is partially associated with increased MTCT rates in the country. Male involvement is at the intersection of individual experiences, social locations, organizational and systemic forces. It is crucial that PMTCT interventions are co-designed with all stakeholders, using approaches which account for such interconnected elements. This study, aims to provide a deeper understanding of male involvement using an intersectionality framework.MethodsWe used an intersectional theoretical approach as it positions male involvement at the intersection of social location, systemic forces, individual experiences, and dynamics within couples. We applied an interpretative qualitative description design. The study was performed at St-Camille's hospital in Ouagadougou, Burkina Faso. Our sample was theoretical to contrast for individual experiences and socioeconomic characteristics. Eligible women were identified via chart review and invited to participate with their male partners. We conducted individual semi-structured interviews with 12 couples. We performed a semantic thematic analysis using QDA Miner to identify themes and patterns among subjective perspectives, while accounting for variations between individuals.ResultsWe interviewed 12 couples; 6 were serodiscordant. All women were HIV-positive. Participant ages ranged from 23 to 48 years. We found male involvement to be multidimensional and multifaceted, covering a large spectrum (from rejection to true partnership) and diverse involvement. Male involvement was limited by competing priorities, contradictory expectations, organizational opportunities and societal beliefs. We found interactions with caregivers impacted male involvement.ConclusionThis study contributed to enhancing our understanding of male involvement in PMTCT of HIV as a dynamic result of the interconnected individual, organizational and systemic experiences. Increasing male involvement will require implementation of coordinated interventions. Such interventions must strive to simultaneously integrate individual, organizational and systemic actions together.

Project description:BackgroundIn the context of widespread mosquito resistance to currently available pesticides, novel, precise genetic vector control methods aimed at population suppression or trait replacement are a potentially powerful approach that could complement existing malaria elimination interventions. Such methods require knowledge of vector population composition, dynamics, behaviour and role in transmission. Here were characterized these parameters in three representative villages, Bana, Pala and Souroukoudingan, of the Sudano-Sahelian belt of Burkina Faso, a region where bed net campaigns have recently intensified.MethodsFrom July 2012 to November 2015, adult mosquitoes were collected monthly using pyrethroid spray catches (PSC) and human landing catches (HLC) in each village. Larval habitat prospections assessed breeding sites abundance at each site. Mosquitoes collected by PSC were identified morphologically, and then by molecular technique to species where required, to reveal the seasonal dynamics of local vectors. Monthly entomological inoculation rates (EIR) that reflect malaria transmission dynamics were estimated by combining the HLC data with mosquito sporozoite infection rates (SIR) identified through ELISA-CSP. Finally, population and EIR fluctuations were fit to locally-collected rainfall data to highlight the strong seasonal determinants of mosquito abundance and malaria transmission in this region.ResultsThe principal malaria vectors found were in the Anopheles gambiae complex. Mosquito abundance peaked during the rainy season, but there was variation in vector species composition between villages. Mean survey HLC and SIR were similar across villages and ranged from 18 to 48 mosquitoes/person/night and from 3.1 to 6.6% prevalence. The resulting monthly EIRs were extremely high during the rainy season (0.91-2.35 infectious bites/person/day) but decreased substantially in the dry season (0.03-0.22). Vector and malaria transmission dynamics generally tracked seasonal rainfall variations, and the highest mosquito abundances and EIRs occurred in the rainy season. However, despite low residual mosquito populations, mosquitoes infected with malaria parasites remained present in the dry season.ConclusionThese results highlight the important vector control challenge facing countries with high EIR despite the recent campaigns of bed net distribution. As demonstrated in these villages, malaria transmission is sustained for large parts of the year by a very high vector abundance and high sporozoite prevalence, resulting in seasonal patterns of hyper and hypo-endemicity. There is, therefore, an urgent need for additional vector control tools that can target endo and exophillic mosquito populations.

Dataset Information

Altered vaginal microbiota are associated with perinatal mother-to-child transmission of HIV in African women from Burkina Faso.

Publications

Altered vaginal microbiota are associated with perinatal mother-to-child transmission of HIV in African women from Burkina Faso.

Similar Datasets

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