How many people in the US are infected with an STI? Are many of those infected people adolescents?

It is estimated that in 2013 there were:1
– 20 million new cases of STIs
– 110 million total cases of STIs- a combination of new infections and long-term infections

About half of the new cases occurred in 15- to 24- year olds, even though they make up only 25% of the sexually active population. Data from the 2014 STD surveillance, shows both the numbers and rates of reported cases of Chlamydia and Gonorrhea occurred among 15 – 24 year olds.2

1. Satterwhite CL, et al. Sexually transmitted infections among U.S. women and men: Prevalence and incidence estimates, 2008. Sex Transm Dis 2013; 40(3): pp. 187-193.

2. Centers for Disease Control and Prevention, “Reported STDs in the United States: 2014 national Data for Chlamydia, Gonorrhea, and Syphilis,” Accessed May 2016


Updated: May 2016