Clark, Catherine;
Smith, Kathy;
Ednie, Lois;
Bogdanovich, Tatiana;
Dewasse, Bonifacio;
McGhee, Pamela;
Appelbaum, Peter C.
In Vitro Activity of DC-159a, a New Broad-Spectrum Fluoroquinolone, Compared with That of Other Agents against Drug-Susceptible and -Resistant Pneumococci
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Medientyp:
E-Artikel
Titel:
In Vitro Activity of DC-159a, a New Broad-Spectrum Fluoroquinolone, Compared with That of Other Agents against Drug-Susceptible and -Resistant Pneumococci
Beteiligte:
Clark, Catherine;
Smith, Kathy;
Ednie, Lois;
Bogdanovich, Tatiana;
Dewasse, Bonifacio;
McGhee, Pamela;
Appelbaum, Peter C.
Erschienen:
American Society for Microbiology, 2008
Erschienen in:Antimicrobial Agents and Chemotherapy
Beschreibung:
<jats:title>ABSTRACT</jats:title>
<jats:p>DC-159a yielded MICs of ≤1 μg/ml against 316 strains of both quinolone-susceptible and -resistant pneumococci (resistance was defined as a levofloxacin MIC ≥4 μg/ml). Although the MICs for DC-159a against quinolone-susceptible pneumococci were a few dilutions higher than those of gemifloxacin, the MICs of these two compounds against 28 quinolone-resistant pneumococci were identical. The DC-159a MICs against quinolone-resistant strains did not appear to depend on the number or the type of mutations in the quinolone resistance-determining region. DC-159a, as well as the other quinolones tested, was bactericidal after 24 h at 2× MIC against 11 of 12 strains tested. Two of the strains were additionally tested at 1 and 2 h, and DC-159a at 4× MIC showed significant killing as early as 2 h. Multistep resistance selection studies showed that even after 50 consecutive subcultures of 10 strains in the presence of sub-MICs, DC-159a produced only two mutants with maximum MICs of 1 μg/ml.</jats:p>