Preliminary data from the Centers for Disease Control show that the number of sexually transmitted infections in the US continued to increase in 2017. 45% of chlamydia cases last year were diagnosed in 15- to 24-year-old girls. Syphillis and gonorrhea were on the rise again this year. The latter is particularly concerning because of increasing rates of antibiotic-resistant gonorrhea. We have lots of work to do, in terms of education and prevention. Lots.