Background: Salmonella enterica subsp. enterica serovar Ruiru (antigenic formula 21:y:e,n,x) is a serovar of the O:21 (L) serogroup. This is a very rare serovar, with only two reported cases during the last then years in the US.
Animal reservoir: There is not current evidence that indicates the animal reservoir for S. Ruiru.
Geographical distribution: S. Ruiru is a very rare serovar, only a limited number of descriptions have been reported; specifically, one report of infection in sheep in England and two in Europe (imported soybean from Brazil and imported palm kernel expellers from Indonesia).
Outbreaks: There is only one description of an outbreak in sheep associated with S. Kuiru, the outbreak was reported in 1964, where it caused abortion in ewes.
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