- Calaveras (one horse confirmed);
- Fresno (two confirmed);
- Merced (one confirmed;
- Riverside (one confirmed);
- Sacramento (three confirmed);
- San Diego (one confirmed);
- San Joaquin (seven confirmed);
- Shasta (one confirmed);
- Sutter (two confirmed); and
- Ventura (two confirmed).
Arabian Mare Recovering from West Nile Virus in California
Only one of 21 California horses diagnosed with WNV in 2016 had a know vaccine histories. Seven of the horses have died.
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