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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. The classification scheme of serovar Paratyphi B has changed over time since infections associated with this serovar were first reported in the late 1800s. 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+. Serovar Paratyphi B has also been found in some animals such as dogs and in pet fish tanks.
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Outbreaks: Several outbreaks have been associated with S. Paratyphi B.
| Year | Location | Associated Sourcesource | Number of Casescases |
|---|---|---|---|
| 2015 | US: Multistate | Sprouted nut butter spread | 13 |
| 2015 | US: Multistate | Frozen raw tuna | 65 |
| 2012 | US: Multistate | Tempeh | 63 |
| 1999 | Canada | Alfalfa sprouts | 51 |
| 1986 | UK | Food Handler | 3 |
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- https://doi.org/10.1038/s41467-024-54418-4
- https://ndc.services.cdc.gov/case-definitions/salmonella-paratyphi-infection-2019/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC3291456/
- https://wwwnc.cdc.gov/eid/article/26/6/19-1121_article
- https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2025.1547190/full
- https://archive.cdc.gov/www_cdc_gov/salmonella/paratyphi-b-05-15/index.html
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- https://www.foodsafetynews.com/2012/05/rare-salmonella-paratyphi-outbreak-grows-as-investigation-continues/
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- https://doi.org/10.1017/S0950268800030843
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- https://webgate.ec.europa.eu/rasff-window/screen/notification/467929
- https://archive.cdc.gov/www_cdc_gov/salmonella/paratyphi-b-12-15/advice.html