Nearly 2.3 million cases of chlamydia, gonorrhea, and syphilis were diagnosed in the United States in 2017, according to preliminary data released by the Centers for Disease Control and Prevention (CDC) at the National STD Prevention Conference in Washington, D.C. This surpassed the previous record set in 2016 by more than 200,000 cases and marked the fourth consecutive year of sharp increases in these sexually transmitted diseases (STDs).