patients : seventy-seven evaluable men with objective evidence of nongonococcal urethritis ( 36 in the erythromycin group and 41 in the placebo group ) with a mean age of 28 years , a median duration of urethritis of 3 months , and a median number of three previous antimicrobial regimens .
C0014806
erythromycin
C0041976
urethritis