Background: Salmonella enterica subsp. enterica serovar Typhimurium (antigenic formula 4,5,12:i:1,2) is a widely distributed serovar, representing the second most common serovar in the United States and the European Union. This serovar belongs to the serogroup O:4 (B), its antigenic formula is 4,5,12:i:1,2. There there is one variant named S. Typhimurium var. Copenhagen, which lacks the factor 5 in the O antigen (4,12:i:1,2). This serovar was named Typhimurium because it produces "Typhi like symptoms in the murine model. S. Typhimurium has been used as model to understand the pathogenicity of Salmonella. Serovar Typhimurium can cause disease in a wide range of hosts and invasive strains have been reported in some African countries. This serovar is classified according to the susceptibility to typing phages (phage typing (PT)); one common PT (PT104) was typically found to have resistance to ampicillin, chloramphenicol, streptomycin, sulphonamide and tetracycline (ACSSuT resistance type).
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