http://www.medpagetoday.com/InfectiousDisease/STDs/60900?isalert=1&uun=g885344d5310R7095614u&xid=NL_breakingnews_2016-10-19

The number of cases of a sexually transmitted disease reported in the U.S. reached an all-time high last year, the CDC is reporting.

The combined total of reported chlamydia, gonorrhea, and syphilis cases was more than 1.8 million in 2015, the agency said in its annual Sexually Transmitted Disease Surveillance Report.

Those numbers are probably an underestimate, the agency said in a release, since most STD cases are undiagnosed and untreated. But the treated cases have reached an all-time — and expensive — high: the agency said it estimates the annual cost of therapy at nearly $16 billion.

The reported incidence of all three conditions rose from 2014 — by 5.9% for chlamydia, 12.8% for gonorrhea, and a whopping 19% for primary and secondary syphilis.