What Is the Difference Between STD and STI?

The terms are often used interchangeably but technically different.

STI

  • Pathogen present in body
  • May have NO symptoms

STD

  • Infection that HAS caused symptoms

Why CDC Prefers STI

  • Reduces stigma
  • Many infections are asymptomatic

Common STIs

  • Chlamydia — curable
  • Gonorrhea — treatable
  • Syphilis — curable
  • HPV — vaccine available
  • Herpes — manageable
  • HIV — manageable
  • Trichomoniasis — curable
Source: CDC, American Sexual Health Association.

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