Who is the main carrier for chlamydia?

The main carrier for chlamydia is women under 25. Chlamydia is a sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis. It is the most common STI in the United States, with an estimated 1.3 million new cases each year. Chlamydia is often asymptomatic, especially in women, which means it can go untreated and cause serious health problems, including pelvic inflammatory disease (PID), infertility, and ectopic pregnancy. Women under 25 are at highest risk for chlamydia because they are more likely to have multiple sexual partners and to not use condoms.