Quick Answer

Globally, WHO estimates more than 1 million curable STIs are acquired every day among people aged 15-49. The annual burden: 376 million new cases of chlamydia, gonorrhea, syphilis, and trichomoniasis combined. HIV adds ~1.5 million new infections. HSV affects ~3.7 billion people under 50 (67% of the global population).

  • Daily: >1 million curable STIs among 15-49-year-olds (WHO).
  • Annual: 376 million new cases of 4 curable STIs (chlamydia, gonorrhea, syphilis, trich).
  • HSV: ~3.7 billion people under 50 carry HSV-1; ~491 million carry HSV-2.
  • HPV: ~311 million women have HPV; most men are also carriers.

Context Most Pages Skip

Global numbers dwarf U.S. statistics because of population size, lower screening rates, and different healthcare access. The WHO estimates are based on modeling and surveillance data.

What global numbers mean locally

STIs are a human universal, not a problem of any particular country or behavior. The sheer scale of the numbers underscores that testing and treatment are normal healthcare, not a response to individual failure.

⚕️ 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.