Although young people make up just 25 percent of the American population who are having sex, they account for half of all new cases of sexually transmitted diseases each year, new estimates from the Centers for Disease Control and Prevention say.
The CDC estimates that there are more than 19.7 million new STDs—or sexually transmitted infections, STIs, in public health parlance—in the United States each year.
A lot of these infections are relatively harmless, but some of them can cause major health problems and collectively, they cost billions to treat.
