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Antimicrob. Agents Chemother., Sep 1997, 2019-2022, Vol 41, No. 9
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Comparative antianaerobic activities of the ketolides HMR 3647 (RU 66647) and HMR 3004 (RU 64004)

LM Ednie, MR Jacobs and PC Appelbaum
Department of Pathology (Clinical Microbiology), Hershey Medical Center, Pennsylvania 17033, USA.

HMR 3647 (RU 66647) and HMR 3004 (RU 64004), two ketolides, had MICs at which 50% of the strains are inhibited (MIC50s) of 0.06 to 0.125 microg/ml and MIC90s of 16.0 microg/ml against 352 anaerobes. MIC50s and MIC90s of erythromycin, azithromycin, clarithromycin, and roxithromycin were 0.5 to 2.0 microg/ml and 32.0 to >64.0 microg/ml, respectively. HMR 3647 and HMR 3004 were more active against non- Bacteroides fragilis-group anaerobes (other than Fusobacterium mortiferum, Fusobacterium varium, and Clostridium difficile).

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