Increased Mutation Frequencies in Escherichia coli Isolates Harboring Extended-Spectrum β-Lactamases

Author:

Baquero María-Rosario1,Galán Juan Carlos1,del Carmen Turrientes María1,Cantón Rafael1,Coque Teresa M.1,Martínez José Luis1,Baquero Fernando1

Affiliation:

1. Department of Microbiology, Ramón y Cajal University Hospital, and Centro Nacional de Biotecnología (CSIC-RYC Associated Unit on Antibiotic Resistance and Bacterial Virulence), 28034 Madrid, Spain

Abstract

ABSTRACT Hypermutable (mutation frequency [ f ], ≥4 × 10 −8 ) Escherichia coli strains were more frequently found (43%) in a collection of 89 extended-spectrum β-lactamase (ESBL)-producing isolates from different patients (77 pulsed-field gel electrophoresis clones, 12 ESBL types) than in non-ESBL E. coli (26%) strains ( P = 0.03). Among urinary tract isolates, the frequency of hypermutation was 40% in ESBL versus 26% in non-ESBL isolates ( P = 0.03).

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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