Chlamydia infection
（重定向自Chlamydial Pneumonia）
![](/Images/godic/202501/04/Pap_smear_showing_clamydia_in_the_vacuoles_500x_H&E4107.jpg")
![Inflammation of the cervix in a female patient from chlamydia infection characterized by mucopurulent cervical discharge, redness, and inflammation.](/Images/godic/202501/04/SOA-Chlamydia-trachomatis-female4107.jpg")
![Male patients may develop a white, cloudy or watery discharge (shown) from the tip of the penis.](/Images/godic/202501/04/SOA-Chlamydia-trachomatis-male4107.jpg")
![Conjunctivitis due to chlamydia.](/Images/godic/202501/04/SOA-conjunctivitis4107.jpg")
Chlamydia infection is a common sexually transmitted infection in humans caused by the bacterium Chlamydia trachomatis. The term Chlamydia infection can also refer to infection caused by any species belonging to the bacterial family Chlamydiaceae. C. trachomatis is found only in humans. Chlamydia is a major infectious cause of human genital and eye disease. Chlamydia conjunctivitis or trachoma is a common cause of blindness worldwide. The World Health Organization (WHO) estimates that it accounted for 15% of blindness cases in 1995, but only 3.6% in 2002.