How Common Are STDs? US & Global Numbers

The headline numbers (2023–2026 data)

CDC's 2023 surveillance report — the most recent full year — showed mixed trends: gonorrhea declined for the second straight year, while syphilis climbed to rates unseen since the 1950s and congenital syphilis reached a thirty-year peak. Total reported STIs remain near record territory.

Global scale

The World Health Organization's latest estimates: more than 1 million curable STIs acquired daily worldwide among adults 15–49 — roughly 374 million new chlamydia, gonorrhea, syphilis or trichomoniasis infections per year. Add viral infections and the picture grows: an estimated 846 million people aged 15–49 live with genital herpes, and HPV infects most sexually active humans at some point.

Who's most affected

• Age 15–24: account for about half of all new US STIs despite being a quarter of the sexually experienced population.
• Gay and bisexual men: carry disproportionate shares of syphilis, gonorrhea and new HIV diagnoses.
• Racial and ethnic minorities: Black, Hispanic and Native American communities experience rates several times higher than average — driven by healthcare access gaps, not behavior.
• Pregnant people: congenital syphilis cases rose tenfold over the past decade, making first-trimester screening critical.

Geography matters too — see which states top the rankings in highest STD rate states.

What these numbers mean for you

Two takeaways. First, you are not unusual: if 1 in 5 adults carries something right now, an infection says nothing about your worth. Second, prevalence makes testing math simple — with this much circulation, periodic screening is basic maintenance for anyone sexually active outside a fully tested monogamous relationship.

Our testing frequency guide translates CDC recommendations into a personal schedule.