Investigation of plasmid-borne AmpC β-lactamase genes in Escherichia coli and Klebsiella spp. revealed blaCMY-2-like genes predominantly in E. coli and blaDHA genes equally distributed between both species. This distribution remained stable over time, but blaACT/MIR-like genes, initially common in Klebsiella spp., were not identified in more recent isolates.
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