Background: Salmonella enterica subsp. enterica serovar Oslo (antigenic formula 6,7,14:a:e,n,x) is a serovar of the serogroup O:7 (C1). Strains in this group can be lysogenized by phage 14 (O:6,7 ––> O:6,7,14, former group C4). The Oslo serptype serotype is rare with about 25 cases reported each year in the US.
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