Reduced Susceptibility to Cefepime among Escherichia coli Clinical Isolates Producing Novel Variants of CMY-2 β-Lactamase

Reduced Susceptibility to Cefepime among Escherichia coli Clinical Isolates Producing Novel Variants of CMY-2 β-Lactamase CMY-29 and CMY-30, Two Novel Plasmid-Mediated AmpC β-Lactamases CMY-31 and CMY-36 Cephalosporinases Encoded by ColE1-Like Plasmids Characterization of Cefoxitin-Resistant Escherichia coli Isolates from Recreational Beaches and Private Drinking Water in Canada between 2004 and 2006 New Variant of CTX-M-Type Extended-Spectrum β-Lactamases, CTX-M-71, with a Gly238Cys Substitution in a K lebsiella pneumoniae Isolate from Bulgaria TEM-168, a Heretofore Laboratory-Derived TEM β-Lactamase Variant Found in an Escherichia coli Clinical Isolate Characterization of CSP-1, a Novel Extended-Spectrum β-Lactamase Produced by a Clinical Isolate of Capnocytophaga sputigena Extended-Spectrum Properties of CMY-30, a Val211Gly Mutant of CMY-2 Cephalosporinase Extended-Spectrum Cephalosporinases in Pseudomonas aeruginosa Convergent In Vivo and In Vitro Selection of Ceftazidime Resistance Mutations at Position 167 of CTX-M-3 β-Lactamase in Hypermutable Escherichia coli Strains