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Background: Salmonella enterica subsp. enterica serovar Paratyphi B (antigenic formula 1,4,[5],12:b:1,2) is a serovar of the O:4 (B) serogroup. Serovar Paratyphi B can be classified by its ability to ferment tartrate. Serovar Paratyphi B (tartrate negative) is associated with paratyphoid fever and infections with this serovar are not common in the US. Serovar Paratyphi B (tartrate positive), formerly serovar Java, is associated with gastroenteritis and can also be written as serovar Paratyphi B var. L(+) tartrate+. 

NCBI PD link for serovar Paratyphi B: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=Paratyphi%20B%22)

NCBI PD link for serovar Paratyphi B var. L(+) tartrate+: https://www.ncbi.nlm.nih.gov/pathogens/isolates/#(taxgroup_name:%22Salmonella%20enterica%22)%20AND%20computed_types:(%22serotype=Paratyphi%20B%20var.%20L(+)%20tartrate+%22)

Animal reservoir: Serovar Paratyphi B is almost exclusively host restricted to humans and closely related anthropoids. Serovar Paratyphi B var. Java has been found in dogs. 

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