Beta-lactam resistance in Aeromonas spp. caused by inducible beta-lactamases active against penicillins, cephalosporins, and carbapenems
Open Access
- 1 September 1988
- journal article
- research article
- Published by American Society for Microbiology in Antimicrobial Agents and Chemotherapy
- Vol. 32 (9), 1314-1319
- https://doi.org/10.1128/aac.32.9.1314
Abstract
Use of cefoperazone in a patient with Aeromonas caviae in the respiratory tract selected a mutant that constitutively produced beta-lactamase. This mutant, in contrast to its parental strain with an inducible beta-lactamase, showed enhanced resistance to newer cephalosporins and aztreonam. This observation suggested that species of Aeromonas, like those of other genera with inducible beta-lactamases, may pose therapeutic problems associated with the rapid development of multiple beta-lactam resistance. Thus, a study was designed to identify the beta-lactamases in 12 strains representing four species of Aeromonas and assess their role in drug resistance. Eleven strains possessed inducible beta-lactamases. One strain showed no detectable activity. An analysis of substrate and inhibitor profiles, isoelectric points, and beta-lactam susceptibility patterns revealed the presence of at least four distinguishable inducible beta-lactamases. These enzymes were involved in the resistance of strains within the genus to penicillins, cephalosporins, aztreonam, and imipenem but not cefoxitin. Unlike most other organisms with inducible beta-lactamases, all four strains of A. caviae, one of four strains of A. sobria, and one of three strains of A. hydrophila possessed two distinct inducible beta-lactamases. Furthermore, substrate and inhibitor profiles revealed that many of these Aeromonas beta-lactamases were distinct from inducible enzymes that have been characterized in other genera of gram-negative bacteria.This publication has 26 references indexed in Scilit:
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