Prevalence of Extended-Spectrum-β-Lactamase- and/or Carbapenemase-Producing Escherichia coli Isolated from Yellow-Legged Gulls from Barcelona, Spain.

Seventy-two (54.5%) out of 132 fecal samples from a group of yellowlegged gulls in Barcelona, Spain, were positive for Escherichia coli producing either extended-spectrum beta-lactamases (ESBL) (51.5%), carbapenemase (1.5%), or cephamycinase (1.5%). The isolation of two carbapenemase-producing E. coli strains is a matter of concern.