The emergence of carbapenemase-producing Enterobacteriaceae is of great concern to public health worldwide. The aim of this study was to screen for the presence of carbapenemase-producing Enterobacteriaceae in white stork (Ciconia ciconia) migratory bird stools, and to investigate their molecular support on β-lactamase production. In March 2015, 32 fecal samples of white stork were collected in the Commune of El Madher Wilaya de Batna, in eastern Algeria. Samples were subjected to selective isolation of carbapenem-resistant Enterobacteriaceae. Representative colonies were screened phenotypically for carbapenemase production. Carbapenemase-producing isolates were subjected to antibiotic susceptibility testing and extended-spectrum β-lactamase (ESBL) coproduction. β-Lactamase determinants were searched for by PCR and sequencing. Three carbapenemase-producing Escherichia coli were obtained. Only one strain was positive for ESBL production. The OXA-48-type carbapenemase-encoding gene was detected in all isolates. Screening for other β-lactamase-encoding genes showed that all isolates coexpress the blaTEM gene, whereas one of them additionally harbored the blaCTX-M-15 ESBL gene. Multilocus sequence typing results showed that two strains belonged to the sequence type 38. This work demonstrated for the first time that the migratory white stork can play an important role in the dissemination of OXA-48-producing E. coli as a potential reservoir and vector.
Keywords: Ciconia ciconia; Escherichia coli; OXA-48 carbapenemase; migratory birds; sequence type ST38.