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Journal of Antimicrobial Chemotherapy (2000) 45, 877-880
© 2000 The British Society for Antimicrobial Chemotherapy

Brief reports

ß-Lactamase expression in Plesiomonas shigelloides

Matthew B. Avison*, Peter M. Bennett and Timothy R. Walsh

Bristol Centre for Antimicrobial Research and Evaluation (BCARE), Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, UK

We have examined the production of ß-lactamases by 11 clinical and nine environmental isolates of Plesiomonas shigelloides from Czechoslovakia, the Czech Republic and Cuba. Ten isolates (50%) expressed detectable amounts of a chromosomally encoded, non-inducible ß-lactamase, though all isolates showed a broadly similar resistance profile: low-level resistance to ampicillin and higher-level resistance to carbenicillin. All strains were susceptible to cephalosporins and meropenem. Three clinical isolates expressed a ß-lactamase similar to a class 2c carbenicillinase, with a pI of 5.2 and three expressed an enzyme similar to a class 2d oxacillinase, with a pI of 5.3. The environmental isolates produced a variety of penicillinases, indicating that there is a reservoir of heterogeneous ß-lactamase genes in this species.

* Corresponding author. Tel: +44-117-9287541; Fax: +44-117-9287896; E-mail: matthewb.avison{at}bris.ac.uk


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