Quick Answer

Having an STD increases HIV risk by 2-5 times. The mechanism: STIs cause inflammation that recruits immune cells (CD4+ T-cells) to the genital area, which are exactly the cells HIV targets. Open sores from syphilis or herpes also provide direct entry portals for the virus.

  • Gonorrhea/chlamydia: inflammation recruits T-cells to the cervix/urethra, increasing HIV susceptibility.
  • Syphilis: open chancre provides a direct portal for HIV entry.
  • Herpes: micro-ulcerations in genital skin create entry points.
  • Trichomoniasis: inflammation and micro-tears increase HIV acquisition risk 2-3x.

Context Most Pages Skip

The STD-HIV synergy is well-established in epidemiology. Controlling STIs reduces HIV transmission at the population level.

Practical implication

If you have sex with partners whose HIV status you do not know, treating STIs promptly reduces your HIV acquisition risk. DoxyPEP (doxycycline after sex) reduces both bacterial STIs and, indirectly, HIV risk. PrEP remains the primary HIV prevention tool.

⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.