Extended-spectrum β-lactamase production in E. coli strains isolated from clinical bovine mastitis
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The existence and spread of cephalosporin-resistant Gram-negative bacteria in hospital intensive care units has been widely documented worldwide, including in Italy (Pagani et al. 2002). The most common and well-known resistance mechanism is the production of Extended Spectrum β-Lactamases (ESβL), which has been known since the 80’s. These enzymes are able to hydrolyze and inactivate the β-lactamic ring (Livermore 1995). In recent years attention on these enzymes has increased in veterinary medicine (Li et al. 2007). At the same time there has also been increased reporting of these enzymes both in companion animals in contact with humans and in livestock animals (Blanc et al. 2006; Liebana et al. 2006; Sidjabat et al. 2007) and in the environment in which they live (Blanc et al. 2006; Liebana et al. 2006). Therefore, epidemiological surveillance on the diffusion of ESβLs appears to be necessary both to ascertain the efficacy of available antimicrobial drugs and to assess...
KeywordsConjugation E. coli ESβL Mastitis
American Type Culture Collection
Colony Forming Unit
Extended spectrum β-lactamases
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