Chlamydia is a gram-negative obligate intracellular bacteria that causes sexually-transmitted infection.

Chlamydia trachomatis is the primary cause of pelvic inflammatory disease (PID) in women which may lead to ectopic pregnancy, infertility, or chronic pelvic pain.
Most infected females are asymptomatic.
But some females may experience vaginal discharge, dysuria, lower abdominal pain, abnormal vaginal bleeding (postcoital or intermenstrual) or breakthrough bleeding, dyspareunia, conjunctivitis, proctitis and reactive arthritis.