… enzymes, which consequently can now appear in bacteria lacking or poorly expressing a
chromosomal bla AmpC gene, such as Escherichia coli, Klebsiella pneumoniae, and Proteus …

… patients with an isolate of an AmpC β-lactamase-producing E. coli (AmpC-EC) causing
infection (only one strain per patient). Controls were patients with a cephalosporin-susceptible E. …

… The most commonly available commercial methods for rapid detection of AmpC β-lactamases
include the AmpC Etest (bioMérieux, Marcy l’Etoile, France) and the D69C …

… AmpC activity in Escherichia coli, namely, mutations in the ampC promoter and attenuator
regions resulting in ampC overexpression and acquisition of plasmid-carried ampC genes. In …

… An AmpC phenotype in this study was defined as any E. coli with a ceftriaxone and/or
ceftazidime MIC of ≥1 mg/L and a cefoxitin MIC ≥32 mg/L that is ESBL negative by the CLSI …

… β-lactamase such as Klebsiella spp., Escherichia coli, or Salmonella spp. The plasmid-encoded
or ‘imported’ ampC β-lactamase … be considered a potential AmpC-producing organism …

… AmpC beta-lactamases are cephalosporinases that confer resistance to a wide variety of
β-lactam … of occurrence of AmpC beta-lactamases inEscherichia coli, Klebsiella pneumoniae, …

… of extended-spectrum β-lactamase (ESBL)- and AmpC β-lactamase-producing Escherichia
coli at Dutch broiler farms and in farmers and to compare ESBL/AmpC-producing isolates …

… -dimensional (M3D) assay for the detection of AmpC production in Escherichia coli and
Klebsiella pneumoniae. Clinical isolates of cefoxitin-resistant E. coli (n = 5) and K. pneumoniae (…

… However, because the region around serine-80 of the ampC f3-lactamase … ampC
cephalosporinase as well as related cephalosporinases form a distinct group of serine P-lactamases …