Incidence and epidemiology of levofloxacin resistance in Streptococcus pneumoniae: Experience from a tertiary referral hospital in England

David Orr*, Paul Wilkinson, Laura Moyce, Siobhan Martin, Robert George, Bruno Pichon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Objectives: To investigate the incidence of levofloxacin resistance in Streptococcus pneumoniae isolates cultured by Lancashire Teaching Hospitals NHS Foundation Trust (LTHTR), and detect cases of in vivo resistance development. Methods: During the study period (September 2004-February 2007), isolates of S. pneumoniae cultured by the LTHTR microbiology laboratory were examined by Etest to determine MICs of levofloxacin. Isolates from patients in whom there was a shift towards colonization with S. pneumoniae of reduced levofloxacin susceptibility were further characterized by serotyping, multilocus sequence typing (MLST) and sequencing of parC and gyrA genes. Results: Eight hundred and sixty-five isolates were collected; however, 772 isolates from 652 patients were recoverable; 412 (53.4%) came from hospitalized patients, 12 (1.6%) were resistant to levofloxacin according to the BSAC breakpoint (>2 mg/L) and 29 (3.8%) had MICs at the breakpoint (MIC=2 mg/L). Of six patients in whom there was a shift towards isolates with reduced levofloxacin susceptibility, five had acquired new distinct strains. One patient, who had a parC mutation (Ser79Phe) in the original susceptible isolate and an additional second-step mutation in the gyrA gene (Ser81Phe) of the later resistant one, had isolates belonging to the same pneumococcal clone. Conclusions: S. pneumoniae resistance to levofloxacin was uncommon and we managed to identify only one case of probable in vivo resistance development in the 2.5 years of the study. Strain replacement accounted for the majority of incidences where there was an apparent shift towards colonization with isolates of reduced levofloxacin susceptibility.

Original languageEnglish
Article numberdkp463
Pages (from-to)449-452
Number of pages4
JournalJournal of Antimicrobial Chemotherapy
Volume65
Issue number3
DOIs
Publication statusPublished - 17 Dec 2009

Bibliographical note

Funding Information:
We thank laboratory staff from the Department of Microbiology in LTHTR for their participation in collecting isolates for this research. This publication made use of the MLST website (http://www.mlst.net) at Imperial College London developed by David Aanensen and funded by the Wellcome Trust.

Funding Information:
Supported by Seedcorn funding from LTHTR.

Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.

Keywords

  • MLST
  • Mutations
  • Pneumonia
  • gyrA
  • parC

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