Chlamydia is a bacterium that can affect a variety of body parts, but typically targets the cervix in women and the urethra in men. In both men and women, the bacterium can spread further into the reproductive organs and cause sterility. Chlamydia is the most commonly transmitted bacterial infection in America. Symptoms appear only 25% of the time for women and 50% of the time for me. They include unusual discharge, pain during urination, inflammation, and pain during intercourse. Chlamydia is spread through vaginal, oral, and anal sex. It can be treated with antibiotics. Condoms provide good protection from this STI. Chlamydia can be tested for by a simple urine test.