Update: Sexually transmitted infections, active component, U.S. Armed Forces, 2011-2019.

This report summarizes incidence rates of the 5 most common sexually transmitted infections (STIs) among active component service members of the U.S. Armed Forces during 2011-2019. Infections with chlamydia were the most common, followed in decreasing order of frequency by infections with genital human papillomavirus (HPV), gonorrhea, genital herpes simplex virus (HSV), and syphilis. Compared to men, women had higher rates of all STIs except for syphilis. In general, compared to their respective counterparts, younger service members, non-Hispanic black service members, soldiers, and enlisted members had higher incidence rates of STIs. The incidence of chlamydia and gonorrhea generally increased among both male and female service members in the latter half of the surveillance period but may have begun to level off or decrease in 2019. Rates of syphilis increased for male service members through 2018 but decreased slightly in 2019; the rate among female service members increased from 2011 to 2014 but leveled off through 2018 before increasing in 2019. The incidence of genital HPV generally decreased among both male and female service member but rose slightly among women in 2019; HSV incidence decreased among both male and female service members. Similarities to and differences from the findings of the last MSMR update on STIs are discussed.