Abstract
Clindamycin hydrochloride was moderately active in vitro against C. trachomatis when it was added to the culture system 1 h, but not 48 h, after inoculation of test organisms. Clindamycin is almost as active in vitro against C. trachomatis as is erythromycin in vitro; this finding suggests that clindamycin might have clinically (human) significant activity in vivo.