Chlamydia trachomatis is a type of bacteria that causes the sexually transmitted infection known as chlamydia. It primarily affects the genital tract, but can also infect the rectum and throat. Many people infected with Chlamydia trachomatis do not show symptoms, which can lead to complications if left untreated. Diagnosis is typically made through laboratory tests, and treatment usually involves antibiotics. If untreated, Chlamydia trachomatis can lead to serious health issues, including pelvic inflammatory disease (PID) in women and infertility in both men and women. Regular screening is recommended for sexually active individuals to prevent transmission.