In vitro susceptibility of anaerobes to quinolones in the United States

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
D W Hecht, H M Wexler

Abstract

The in vitro activity of early fluoroquinolone antibodies--including ciprofloxacin, ofloxacin, fleroxacin, pefloxacin, enoxacin, and lomefloxacin--against most anaerobes has been limited, a characteristic making them poor choices as antianaerobic agents. Newer fluoroquinolones, including levofloxacin, sparfloxacin, and grepafloxacin, have moderate activity against anaerobes, including the Bacteroides fragilis group as well as Clostridium, Peptostreptococcus, Prevotella, and Fusobacterium species. Fluoroquinolones that demonstrate the greatest activity against the B. fragilis group and other anaerobes include DU-6859a, clinafloxacin, and the related naphthyridone, trovafloxacin. There has been wide variation in the susceptibility results among different studies testing the same antibiotic; such variation may be due in part to the use of different methodologies, inoculum sizes, and testing media. In a direct comparison of susceptibility findings for ciprofloxacin, ofloxacin, and levofloxacin in three different media, we have determined that twofold dilution differences in minimum inhibitory concentration (MIC) values (MIC90, mode MIC, and geometric mean MIC) may occur in association with the choice of testing media. Thus, testing...Continue Reading

Citations

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