List of sexually transmitted infections by prevalence

Sexually transmitted infections (STIs), also referred to as sexually transmitted diseases (STDs), are infections that are commonly spread by sexual activity, especially vaginal intercourse, anal sex and oral sex. The most prevalent STIs may be carried by a significant fraction of the human population.

STINumber of people with diseaseNotes Herpes 4,000,000,000 It is estimated that more than two-thirds of the global population has herpes, though it mostly lies dormant. Human papillomavirus infection 800,000,000 Chlamydia 450,000,000 Hepatitis B 356,000,000 Preventable with the Hepatitis B vaccine Gonorrhea 50,000,000 Globally, 0.8% (women) and 0.6% (men) have gonorrhea. Syphilis 45,400,000 HIV/AIDS 36,700,000

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