Population and dyadic-based seroincidence of herpes simplex virus-2 and syphilis in southern India
- PMID: 25605970
- PMCID: PMC4518737
- DOI: 10.1136/sextrans-2014-051708
Population and dyadic-based seroincidence of herpes simplex virus-2 and syphilis in southern India
Erratum in
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Correction.Sex Transm Infect. 2018 May;94(3):235. doi: 10.1136/sextrans-2014-051708corr1. Epub 2015 Nov 6. Sex Transm Infect. 2018. PMID: 26546344 Free PMC article. No abstract available.
Abstract
Objectives: Herpes simplex virus-2 (HSV-2) and syphilis are associated with increased risk of HIV, highlighting the importance of understanding their transmission dynamics. In India, most studies of HSV-2 and syphilis incidence are in high-risk populations and may not accurately reflect infectious activity. In this study, we aim to define HSV-2/syphilis incidence and risk factors in a population sample.
Methods: We conducted a longitudinal population-based survey in Andhra Pradesh, India, in two rounds: 2004-2005 and 2010-2011. Sociodemographic and behavioural data were collected, and dried blood spots tested for HSV-2 and Treponema pallidum IgG. After calculating sexually transmitted infection (STI) incidence, associated factors were assessed using modified Poisson regression and within-couple transmission rates modelled using seroconcordance/discordance data.
Results: 12,617 adults participated at baseline with 8494 at follow-up. Incidence of HSV-2 and syphilis per 1000 person-years was 25.6 (95% CI 24.1 to 27.2) and 3.00 (95% CI 2.52 to 3.54). Incidence of HSV-2 was higher in women vs. men (31.1 vs. 20.2) and in rural vs urban residents (31.1 vs 19.0) (p<0.05 for both). STI seroincidence increased in a step-wise fashion with age and was associated with spousal seropositivity for both sexes (incidence rate ratio (IRR) 2.59 to 6.78). Within couples the rate of transmission per 1000 couple-years from men to women vs. women to men was higher for HSV-2 (193.3 vs. 119.0) compared with syphilis (27.6 vs. 198.8), p<0.05 for both.
Conclusions: HSV-2 has higher incidence among subpopulations such as women, rural residents and older-aged individuals, suggesting a need for more generalised STI prevention approaches among populations traditionally considered low risk.
Keywords: EPIDEMIOLOGY (GENERAL); HIV; HSV; INDIA; SYPHILIS.
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