Dissemination in Portugal of CTX-M-15-, OXA-1-, and TEM-1-Producing Enterobacteriaceae Strains Containing the aac(6 ′ )-Ib-cr Gene, Which Encodes an Aminoglycoside- and Fluoroquinolone-Modifying Enzyme

Abstract

CTX-M-15, recently detected in Portugal, is an extended-spectrum β-lactamase (ESBL) that has spread worldwide ([3][1], [4][2], [9][3], [10][4], [15][5]). The basis for the successful dissemination of bla CTX-M-15 is unknown, although the spread of epidemic Escherichia coli strains and/or