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High prevalence of bla(CTX-M-1)-group extended-spectrum beta-lactamase genes in Enterobacteriaceae isolates from Emilia-Romagna, Italy.

The production of extended-spectrum b-lactamases (ESBLs) by members of the Enterobacteriaceae is an increasing challenge in the treatment of infections. The ESBL type that has been detected most frequently over the last few years is CTXM, which also has the particular ability to spread in the community (Pitout & Laupland, 2008). In Emilia-Romagna, a northern Italian region with a population of about 4 million, the rate of resistance to b-lactamase due to ESBLs increased rapidly in the period 2003–2006 (Gagliotti et al., 2008a). No data on the type of circulating ESBL are available at the regional level. This study aims to describe the epidemiology of ESBLs by testing a sample of clinical ESBL-producing strains that were isolated in Emilia-Romagna.