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Antimicrobial Agents and Chemotherapy, February 1999, p. 329-334, Vol. 43, No. 2
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Activities of Newer Fluoroquinolones against Streptococcus pneumoniae Clinical Isolates Including Those with Mutations in the gyrA, parC, and parE Loci

J. H. Jorgensen,1,* L. M. Weigel,2 M. J. Ferraro,3 J. M. Swenson,2 and F. C. Tenover2

Department of Pathology, The University of Texas Health Science Center, San Antonio, Texas 782841; Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia 303332; and The Massachusetts General Hospital, Boston, Massachusetts 021143

Received 24 June 1998/Returned for modification 21 September 1998/Accepted 25 November 1998

Resistance to fluoroquinolone (FQ) antibiotics in Streptococcus pneumoniae has been attributed primarily to specific mutations in the genes for DNA gyrase (gyrA and gyrB) and topoisomerase IV (parC and parE). Resistance to some FQs can result from a single mutation in one or more of the genes encoding these essential enzymes. A group of 160 clinical isolates of pneumococci was examined in this study, including 36 ofloxacin-resistant isolates (MICs, >= 8 µg/ml) recovered from patients in North America, France, and Belgium. The susceptibilities of all isolates to clinafloxacin, grepafloxacin, levofloxacin, sparfloxacin, and trovafloxacin were examined by the National Committee for Clinical Laboratory Standards reference broth microdilution and disk diffusion susceptibility testing methods. Among the ofloxacin-resistant strains, 32 of 36 were also categorized as resistant to levofloxacin, 35 were resistant to sparfloxacin, 29 were resistant to grepafloxacin, and 19 were resistant to trovafloxacin. In vitro susceptibility to clinafloxacin appeared to be least affected by resistance to the other FQs. Eight isolates with high- and low-level resistance to the newer FQs were selected for DNA sequence analysis of the quinolone resistance-determining regions (QRDRs) of gyrA, gyrB, parC, and parE. The DNA and the inferred amino acid sequences of the resistant strains were compared with the analogous sequences of reference strain S. pneumoniae ATCC 49619 and FQ-susceptible laboratory strain R6. Reduced susceptibilities to grepafloxacin and sparfloxacin (MICs, 1 to 2 µg/ml) and trovafloxacin (MICs, 0.5 to 1 µg/ml) were associated with either a mutation in parC that led to a single amino acid substitution (Ser-79 to Phe or Tyr) or double mutations that involved the genes for both GyrA (Ser-81 to Phe) and ParE (Asp-435 to Asn). High-level resistance to all of the compounds except clinafloxacin was associated with two or more amino acid substitutions involving both GyrA (Ser-81 to Phe) and ParC (Ser-79 to Phe or Ser-80 to Pro and Asp-83 to Tyr). No mutations were observed in the gyrB sequences of resistant strains. These data indicate that mutations in pneumococcal gyrA, parC, and parE genes all contribute to decreased susceptibility to the newer FQs, and genetic analysis of the QRDR of a single gene, either gyrA or parC, is not predictive of pneumococcal resistance to these agents.

* Corresponding author. Mailing address: Department of Pathology, University of Texas Health Science Center, 7703 Floyd Curl Dr., San Antonio, TX 78284-7750. Phone: (210) 567-4088. Fax: (210) 567-2367. E-mail: jorgensen{at}uthscsa.edu.

Antimicrobial Agents and Chemotherapy, February 1999, p. 329-334, Vol. 43, No. 2
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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