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“Background

Extended-spectrum β-lactamase (ESBL)-producing bacteria represent a major worldwide threat among drug-resistant bacteria in both hospital and community settings [1]. ESBLs are among the Ambler classes A, confer resistance to β-lactam antibiotics except cephamycins and carbapenems, and are inhibited by clavulanic acid [1]. ESBLs are often located on large plasmids that also harbor resistant genes to other antimicrobial classes with resulting multidrug-resistant isolates [2]. The first ESBLs have evolved by genetic mutation very from native β-lactamases TEM and SHV [3][4]. Recently, a novel type of ESBLs, the CTX-M enzymes, emerged worldwide, mostly from Enterobacteriaceae[5, 6]. CTX-M β-lactamases are not closely related to TEM or SHV ESBLs but share high amino-acid identity with chromosomal β-lactamases from Kluyvera spp. [7]. Now, bla CTX-M-15 is recognized as the most widely distributed CTX-M enzyme [8]. It is derived from CTX-M-3 by a substitution of Asp-240-Gly which increases its catalytic efficiency against ceftazidime [9]. bla CTX-M-15 are encoded on plasmids belonging to the incompatibility group IncF [10].