How many sexually transmitted diseases are there?
The U.S. Centers for Diseased Control (CDC) estimates that 19 million new infections occur each year, almost half of them among 15-24 year olds. 1 CDC reports that there are now more than 50 different organisms and syndromes that are spread through sexual activity. 2 1 Weinstock H, et al. Sexually transmitted diseases among American youth: incidence and prevalence estimates, 2000.