Early emergence of mcr-1-positive Enterobacteriaceae in gulls from Spain and Portugal: Early Emergence of mcr-1 in Gulls

We tested extended‐spectrum β‐lactamase producing bacteria from wild gulls (Larus spp.) sampled in 2009 for the presence of mcr‐1. We report the detection of mcr‐1 and describe genome characteristics of four Escherichia coli and one Klebsiella pneumoniae isolate from Spain and Portugal that also exhibited colistin resistance. Results represent the earliest evidence for colistin‐resistant bacteria in European wildlife.