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Prevalence and Determinants of Sexually Transmitted Infections Among Thai Men Who Have Sex with Men Enrolled in

Chadaporn Inta1, Sirinya Teeraananchai1,2, Suthat Chottanapund3

  • 1. Department of Statistics, Faculty of Science, Kasetsart University, Bangkok, Thailand.

Sexually Transmitted Diseases
|August 11, 2026
PubMed
Abstract

Insights

Sexually transmitted infections (STIs), especially syphilis, are common in Thailand

Area of Science:

  • Public Health
  • Infectious Diseases
  • Epidemiology

Background:

  • Sexually transmitted infections (STIs) represent a significant global health challenge, particularly impacting men who have sex with men (MSM).
  • Thailand's Universal Health Coverage (UHC) program offers pre-exposure prophylaxis (PrEP) to MSM, necessitating an understanding of STI prevalence within this group.

Purpose of the Study:

  • To estimate the prevalence of STIs among MSM enrolled in Thailand's national PrEP registry.
  • To identify factors associated with STI and syphilis incidence in this population.

Main Methods:

  • A cross-sectional analysis was performed on data from 24,606 MSM aged 15-49 years who underwent STI testing between January 2020 and August 2024.
  • Included STIs were syphilis, gonorrhea, chlamydia, and chancroid.
  • Multivariable logistic regression identified factors associated with STI and syphilis.

Main Results:

  • Overall STI prevalence was 8.0% (1,974/24,606), with syphilis being the most common (7.7%).
  • Higher STI prevalence was observed in younger MSM (20-24 years), those with prior PrEP use, and individuals with hepatitis C virus (HCV) infection (24.0%).
  • Factors associated with increased STI risk included younger age, prior PrEP use, and HCV infection.

Conclusions:

  • STIs, particularly syphilis, remain prevalent among MSM in Thailand's national PrEP program.
  • Integrating STI and hepatitis screening into PrEP services is crucial.
  • Targeted prevention strategies are needed for high-risk MSM populations.
Keywords:
Men who have sex with men (MSM)Pre-exposure prophylaxis (PrEP)Sexually transmitted infections (STIs)SyphilisThailand

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