Six hundred fourteen strains of Salmonella enterica were isolated from 16,926 samples of food of animal origin collected in southern Italy from 2003 to 2012. The isolates were identified, serotyped, and challenged against 15 antibiotics according to the protocol defined at national level for veterinary isolates of Salmonella (EnterVet surveillance network). Salmonella serotypes Typhimurium, Hadar, Enteritidis, Derby, and 4,[5],12:i:- were those most frequently isolated. The widest resistances were recorded towards sulfonamides (69 % of the isolates), trimethoprim-sulfamethoxazole (52 % of the isolates), and tetracycline (51 % of the isolates). The rate of multidrug resistance of the isolates decreased significantly from the first 5 years of the study period (82.6 %) to the last 5 years (54.3 %).

Department DiSSPAPA University of Naples Federico 2 Portici Naples Italy

Department of Food Microbiology Centro Pilota Tipizzazione Salmonella Istituto Zooprofilattico Sperimentale del Mezzogiorno Portici Naples Italy

Department of Science and Technology University of Naples Parthenope Naples Italy

National Reference Laboratory for Salmonellosis Istituto Zooprofilattico Sperimentale delle Venezie Legnaro Padova Italy

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