beta-lactamase expression in Plesiomonas shigelloides.
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.
Avison
M B
MB
Bristol Centre for Antimicrobial Research and Evaluation (BCARE), Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, UK. matthewb.avison@bris.ac.uk
Bennett
P M
PM
Walsh
T R
TR
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002876:Chromosomes, Bacterial / Q000235:genetics; D004790:Enzyme Induction / Q000187:drug effects; D007525:Isoelectric Focusing; D008826:Microbial Sensitivity Tests; D009154:Mutation / Q000235:genetics; D016981:Plesiomonas / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics; D018440:beta-Lactam Resistance; D001618:beta-Lactamases / Q000096:biosynthesis* / Q000235:genetics; D047090:beta-Lactams
D000900:Anti-Bacterial Agents; D047090:beta-Lactams; D001618:beta-Lactamases