Journal
SALUD PUBLICA DE MEXICO
Volume 49, Issue 6, Pages 415-421Publisher
INST NACIONAL SALUD PUBLICA
DOI: 10.1590/S0036-36342007000600008
Keywords
enterobacteria; plasmid; ESBL; SHV-5; SHV-2; Mexico
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Objective: In this work we report the molecular characterization of beta-lactam antibiotics resistance conferred by genes contained in plasmids from enterobacteria producing extended-spectrum beta-lactamases (ESBL). Material and Methods: Fourteen enterobacterial clinical isolates selected from a group of strains obtained from seven different hospitals in Mexico during 1990-1992 and 1996-1998 were analyzed at the Bacterial Resistance Laboratory (National Institute Public Health, Cuernavaca). Molecular characterization included PFGE, IEF of beta-lactamases, bacterial conjugation, PCR amplification and DNA sequencing, plasmid extraction and restriction. Results: Isolates were genetically unrelated. ESBL identified were SHV-2 (5/14) and SHV-5 (9/14) type. Cephalosporin-resistance was transferable in 9 of 14 (64%) clinical isolates with only one conjugative plasmid, DNA finger printing showed a similar band pattern in plasmids. Conclusions: The dissemination of cephalosporin resistance was due to related plasmids carrying the ESBL genes.
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