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Geographical distribution: Serovar Hartford has been found in the US, Canada, Australia, the UK, Hungary, and China.
Human Outbreaksoutbreaks:
| Year | Location | Associated Source | Number of Cases |
|---|---|---|---|
| 2023 | US: multistate | Not identified | 54 |
| 2014 | US: multistate | Organic sprouted chia powder1 | 31 |
| 2010 | US: multistate | Not identified | 75 |
| 1995 | US: FL | Unpasteurized orange juice2 | 62 |
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