Journal of Antimicrobial Chemotherapy, Vol 42, 703-709, Copyright © 1998 by The British Society for Antimicrobial Chemotherapy
FJ Boswell, JM Andrews, JP Ashby, C Fogarty, NP Brenwald and R Wise
The in-vitro activity of HMR 3647, a novel ketolide, was investigated in
comparison with those of erythromycin A, roxithromycin, clarithromycin
(14-membered ring macrolides), amoxycillin-clavulanate and ciprofloxacin
against 719 recent clinical Gram-positive, Gram- negative and anaerobic
isolates and type cultures. HMR 3647 generally demonstrated greater
activity than the other compounds with MIC90s of < or =0.5 mg/L, except
for Staphylococcus epidermidis (MIC90 > 128 mg/L), Haemophilus
influenzae (MIC90 = 2 mg/L), Enterococcus faecalis (MIC90 = 2 mg/L),
Enterococcus faecium (MIC90 = 1 mg/L) and the anaerobes, Bacteroides
fragilis (MIC90 = 2 mg/L) and Clostridium difficile (MIC90 = 1 mg/L). In
general, an increase in the size of the inoculum from 10(4) to 10(6) cfu on
selected strains had little effect on the MICs of HMR 3647. Additionally,
the in-vitro activity of HMR 3647 was not affected by the presence of
either 20 or 70% (v/v) human serum. The antichlamydial activity of HMR 3647
was generally greater than that of commonly used antichlamydial
antimicrobials.
The in-vitro activity of HMR 3647, a new ketolide antimicrobial agent [In Process Citation]
Department of Medical Microbiology, City Hospital NHS Trust, Birmingham, UK.
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