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Animal reservoir: Unknown, but this serovar was isolated from poultry and wild boars may be potential reservoirs for serovar Napoli.
Geographical distribution: Serovar Napoli has been reported in US, Canada, Australia, and Europe, mainly in UK and Italy.
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Year | Location | Associated source | Number of cases |
| 2023 | Norway | Not identified | 7 |
| 2014 | Italy | Ham | 47 |
| 2011 | Italy | Water | 10 |
1982 | England and Wales | 245 |
Animal outbreaks:
Year | Location | Breed | Number of cases |
|---|---|---|---|
| 2022-2023 | Italy | Holstein Friesian | 41 |
1 The herd consisted of 310 cows. There were four animals infected: two calves and two milking cows.
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