SALMONELLA SEROTYPE DISTRIBUTION IN DANISH

Abstract The serotype distribution in the Danish swine population and in pork has been remark-able stable during the period 1998-2004. S. Typhimurium remains the predominant serotype in the entire swine population and in pork. S. Derby is increasing in prevalence in herds and in pork. S. Infantis, which was highly prevalent in Danish pork 10 years ago, has reached a low and stable level in herds and in pork. An unexplained increase in rough salmonella isolated from carcasses has taken place during the entire study period. The original antibody ELISA for serological monitor-ing of herds can still be used without adjustments. Introduction The mandatory Danish Salmonella Control Program in swine has been in place since 1995, and operates at all stages of the production chain (Mousing et al. 1997, Nielsen et al. 2001). Bacteriological examinations for Salmonella are carried out at four different places in the program; seropositive breeder and multiplier herds, seropositive finisher herds and sow herds producing weaners for seropositive finisher herds, and at the daily Salmonella monitoring of carcasses a