Nongonococcal urethritis: the role of Chlamydia trachomatis.
D044383:Black People; D002692:Chlamydia trachomatis / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D009174:Mycoplasma / Q000302:isolation & purification; D014521:Urethra / Q000382:microbiology; D014526:Urethritis / Q000382:microbiology*; D044465:White People