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J Antimicrob Chemother. 2000 Jun;45(6):877-80.

beta-lactamase expression in Plesiomonas shigelloides.

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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 beta-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 beta-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 beta-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 beta-lactamase genes in this species.

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