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Antimicrobial Agents and Chemotherapy, February 2000, p. 462-466, Vol. 44, No. 2
MRL Pharmaceutical Services, Utrecht, The
Netherlands1; MRL Pharmaceutical
Services, Herndon, Virginia2; and
Institute for Medical Microbiology and Virology,
Heinrich-Heine University Düsseldorf,
Düsseldorf,3 and Institute of
Pharmaceutical Microbiology, University of Bonn,
Bonn,4 Germany
Received 2 July 1999/Returned for modification 3 September
1999/Accepted 16 November 1999
From 8,419 worldwide clinical isolates of Streptococcus
pneumoniae obtained during 1997-1998, 69 isolates with reduced
susceptibility or resistance to fluoroquinolones (FQs) were molecularly
characterized. For the isolates in this prevalence study, only
parC (Ser-79
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Prevalence of gyrA, gyrB, parC,
and parE Mutations in Clinical Isolates of
Streptococcus pneumoniae with Decreased Susceptibilities to
Different Fluoroquinolones and Originating from Worldwide
Surveillance Studies during the 1997-1998 Respiratory
Season
Tyr) and gyrA (Ser-81
Phe or
Tyr) mutations, especially in combination, were found to contribute
significantly to resistance. These mutations influenced the FQ MICs to
varying degrees, although the rank order of activity remains
independent of mutation type, with ciprofloxacin the least active,
followed by levofloxacin,
gatifloxacin/grepafloxacin/moxifloxacin/sparfloxacin/trovafloxacin, and
clinafloxacin/sitafloxacin. Efflux likely plays a crucial role in
reduced susceptibility for new hydrophilic FQs.
*
Corresponding author. Mailing address: MRL
Pharmaceutical Services, Den Brielstraat 11, 3554XD, Utrecht, The
Netherlands. Phone: 31 30 265 1794. Fax: 31 30 265 1784. E-mail:
mjones{at}thetsn.com.
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