Population and dyadic-based seroincidence of herpes simplex virus-2 and syphilis in southern India

Chad H. Hochberg, John A. Schneider, Rakhi Dandona, Vemu Lakshmi, G. Anil Kumar, Talasila Sudha, Mohammed Akbar, G. Mushtaq Ahmed, Sri P. Ramgopal, Benjamin Armbruster, Michel Alary, Lalit Dandona

Research output: Contribution to journalArticlepeer-review

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 olderaged individuals, suggesting a need for more generalised STI prevention approaches among populations traditionally considered low risk.

Original languageEnglish (US)
Pages (from-to)375-382
Number of pages8
JournalSexually transmitted infections
Volume91
Issue number5
DOIs
StatePublished - Aug 1 2015

ASJC Scopus subject areas

  • Dermatology
  • Infectious Diseases

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