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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 at slaughterhouses. The program gives a unique ability to follow the development in serotype distri- bution in the entire swine production chain over many years. When the program started 10 years ago little was know about fluctuations of Salmonella serotypes over time in the Danish swine production. One of the preconditions for the serological monitoring of the Danish swine herds was knowledge to the distribution of serotypes. If the serotype distribution was stable, the same ELISA could be used over years without adjustments. However, if the serotype distribution changed significantly over time it was imperative to adjust the ELISA to maintain an acceptable high sensitivity. Another important aspect of the bacteriological monitoring is the ability to follow an introduc- tion of a serotype at a certain point in the production chain and its possible spread up and down the production chain. Finally, it is very important to have solid surveillance data in order to esti- mate the number of pork related human salmonellosis. The present study describes the development in Salmonella serotypes from 1998 to 2004. Materials and Methods Results from the bacteriological monitoring of seropositive breeder and multiplier herds, seropositive finisher herds and sow herds producing weaners for seropositive finisher herds were collected from the national data base The Zoonoses Register, owned by the Danish Ministry of Family and Consumer Affairs. Additionally, data from the Salmonella monitoring of carcasses at the slaughterhouses were obtained from the database of the Danish Bacon and Meat Council. Data were collected from 1998 to 2004. Each month, all breeder and multiplier herds are blood sampled and examined for Salmonella antibodies. Based on the level of antibodies, a Salmonella index is calculated. If the index exceeds 5, pen fecal samples must be taken and examined for the presence of Salmonella.

Salmonella serotype distribution in Danish swine herds and pork 1998 - 2004