Sexually Transmitted Diseases (STDs)

Sexually Transmitted Diseases (STDs)

More than 25 diseases are spread primarily through sexual activity. The latest estimates indicate that there are 15 million new sexually transmitted disease cases in the United States each year. Approximately one-fourth of these new infections are in teenagers. Nearly two-thirds of all STD cases occur in people younger than 25 years.

While some sexually transmitted diseases, such as syphilis, have been brought to all-time lows, others, like genital herpes, gonorrhea, and chlamydia, continue to resurge and spread through the population.

Not including HIV, the most common sexually transmitted diseases in the U.S. are chlamydia, gonorrhea, syphilis, genital herpes, human papillomavirus, hepatitis B, and trichomoniasis.

Sexually transmitted
number of
new cases
every year)
number of
people currently
Chlamydia3 million2 million
Herpes1 million45 million
papillomavirus (hpv)
5.5 million20 million
Hepatitis B120,000417,000
Trichomoniasis5 millionn.a.
NOTE: n.a. = not available.
1. No recent surveys on national prevalence for gonorrhea, syphilis, trichomoniasis, or bacterial vaginosis have been conducted.
Source: Centers for Disease Control, 1999.

Common Infectious Diseases Worldwide HealthReported Cases of Sexually Transmitted Disease in the U.S., 2003
Brewer's: Health