ST313 S. Typhimurium isolate D23580 hyperdisseminates to systemic sites in mice ST313 isolate D23580 infects a higher number of CD11b+ migratory DCs in the MLN ST313 isolate D23580 requires CCR7-dependent migration of DCs to hyperdisseminate Pseudogenization of sseI in the ST313 lineage contributes to hyperdissemination