Version May 2024
| Viral taxonomy | Vectors | Incubation period, days | Geographic distribution |
| Togaviridae | |||
| Eastern equine encephalitis virus | Mosquitoes | 3 to 10 | East United States and Canada, South America |
| Western equine encephalitis virus | Mosquitoes | 2 to 10 | West United States and Canada, South America |
| Venezuelan equine encephalitis virus | Mosquitoes | 1 to 4 | Central and South America |
| Flaviviridae | |||
| St. Louis encephalitis virus | Mosquitoes | 4 to 14 | United States |
| Powassan virus | Ticks | 4 to 18 | North United States |
| West Nile virus | Mosquitoes | 5 to 15 | United States, southern Europe, Asia, Africa |
| Japanese encephalitis virus | Mosquitoes | 4 to 14 | Asia |
| Murray Valley encephalitis virus | Mosquitoes | 4 to 14 | Australia and New Guinea |
| Tick-borne encephalitis virus | Ticks | 8 to 14 | Europe |
| Bunyaviridae | |||
| California encephalitis viruses | Mosquitoes | 5 to 15 | West United States, Europe, Asia |
| Snowshoe hare | North United States | ||
| Jamestown Canyon | United States | ||
| La Crosse | Midwest, east, south United States | ||
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