Characterization of extended-spectrum-?-lactamase (CTX-M-15)-producing strains of isolated in France and Senegal

Three clinical isolates of Salmonella enterica recovered between 2000 and 2003 in France and Senegal were found to produce extended-spectrum β-lactamase CTX-M-15. The two isolates from Senegal were recovered from stool of a hospitalized patient with gastroenteritis in 2000 and from an urine specimen of an out-patient with urinary tract infection in 2001. These S. enterica isolates belonged to serotype Kentucky and were clonally related as determined by pulsed-field gel electrophoresis and automated ribotyping. The third isolate of serotype Typhimurium was recovered from a patient hospitalized in France for an acute gastroenteritis acquired in Lebanon. The blaCTX-M-15 gene was located on two different transferable plasmids, one of which also carried blaTEM-1, blaOXA-30, aminoglycoside-, tetracycline-, and sulfamethoxazole–trimethoprim resistance genes. ISEcp1 element was found to be located upstream of blaCTX-M-15 in the same position as reported previously in CTX-M-15-producing Escherichia coli from India and Turkey. This is the first report of blaCTX-M-15 in the genus Salmonella.