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The aim of the study was to evaluate the prevalence of Salmonella spp. in swine herds in Italy. Samples of faeces from finishing swine farms, cecal contents and ileo-cecal lymphnodes from pigs at slaughter were analysed for Salmonella. Samples of blood serum and meat juice were collected from the same groups, and tested for antibodies against Salmonella O-antigens with an ELISA test kit. 6.5% of faeces from finishing swine resulted positive, with 40% of the groups showing at least one positive sample, while Salmonella was isolated from 28.5% of cecal samples (85% of the groups) and 26.4% of lymph nodes (75% of the groups). The results of serology showed positivity in 100% of the herds and 95% of groups at slaughter. S. Typhimurium, S. Infantis, S. Derby were the most frequent isolated serotypes. The lowest frequencies of sus- ceptibility were observed for tetracycline, sulfonamides, streptomycin and ampicillin. Introduction The recent European Regulation, regarding the control of zoonosis in animal popula- tions (Regulation CE 2160/2003 and Directive 2003/99), will require, in the next years, the imple- mentation of monitoring programs for Salmonella in swine. From this the present study has been carried out to preliminarily evaluate the presence of Salmonella spp. in swine in central Italy. Finishing herds and groups at slaughter were considered in the investigation; within these, bacteri- ological and serological tests (ELISA) have been carried out, to investigate the prevalence of infec- tion, the Salmonella serotypes, and the antimicrobial resistance of the isolates. In addition, the possible use of an ELISA test to detect antibodies against Salmonella has been also considered.

An epidemiological survey on the prevalence of Salmonella in swine in central Italy