Detection of CMY-2, CTX-M-14, and SHV-12 β-lactamases in Escherichia coli fecal-sample isolates from healthy chickens

Abstract

Genes encoding the CMY-2, CTX-M-14, and SHV-12 β-lactamases were detected in three of five Escherichia coli isolates from fecal samples from healthy chickens which showed resistance or diminished susceptibility to extended-spectrum cephalosporins. A - 42 mutation at the promoter region of the ampC gene was detected in the other two isolates.