title: Relative resistance to erythromycin in Chlamydia trachomatis.
abstract: Recent Chlamydia trachomatis isolates were tested in a tissue culture system for susceptibility to tetracycline, erythromycin, rosaramicin, rifampin, and clindamycin. Rifampin was the most active drug (minimal inhibitory concentration, less than or equal to 0.02 microgram/ml). Tetracycline and rasaramicin were highly active, with a concentration of less than or equal to 0.25 microgram/ml being chlamydicidal. Clindamycin was least active on a weight basis, requiring up to 16 microgram/ml to prevent the passage of chlamydiae into a drug-free tissue culture system. Relative resistance to erythromycin was detected; two isolates were capable of limited replication in 1 microgram/ml.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002690:Chlamydia Infections / Q000382:microbiology; D002692:Chlamydia trachomatis / Q000187:drug effects*; D004352:Drug Resistance, Microbial; D004917:Erythromycin / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D004917:Erythromycin