Franklin County — A 10-year-old mare from north Pasco has been euthanized after contracting West Nile virus, the state Department of Agriculture announced Thursday.
The horse is the second case of equine West Nile virus reported in the state this year, a news release said. The other confirmed case was in Outlook.
A killing frost will reduce the likelihood of further cases for the year. Horse owners in areas of the state where this disease will overwinter should consider vaccinating for West Nile in 2014 at least a month before the onset of the mosquito season, said Paul Kohrs, the acting state veterinarian, in the news release.
The virus is spread by mosquitoes that have fed on infected birds.