The North Carolina Department of Agriculture and Consumer Services has confirmed a case of equine West Nile virus (WNV) in an unvaccinated horse in Yadkin County.

An unvaccinated 16-year-old Tennessee Walking Horse mare presented during the last week of September with a low-grade fever, ataxia, and posterior paresis; she has slowly improved since disease onset.

The unvaccinated 6-year-old Standardbred mare from Todd County presented on Sept. 26 with ataxia and hyperexcitability. Her condition worsened and she was euthanized on Sept. 29.

Two unvaccinated Quarter Horse mares from Polk County developed ataxia (incoordination) on Sept. 24. Both are being treated symptomatically.

The affected 3-year-old filly from Fayette County presented on Sept. 28 with acute progressive ataxia (incoordination). As of Oct. 2, the fill is reportedly much improved with a favorable prognosis.

The affected yearling Quarter Horse filly from Stephens County was not vaccinated against WNV.

The affected 5-year-old Thoroughbred mare from Woodford County developed neurologic clinical signs on Sept. 18 and was euthanized.

There have been 10 confirmed cases of WNV in Iowa horses so far this year, according to Equine Disease Communication Center data.

Officials have now confirmed 31 cases of WNV in Ohio horses so far this year—more than double the number of cases reported last year.

New cases in Boyle, Harrison, Jackson, and Mercer counties were reported Sept. 20. One affected horse was alive at last update and three had been euthanized. None had been vaccinated against WNV.

Unvaccinated horses and those with unknown vaccination histories from Lyon, Marion, Neosho, Seward, and Wichita counties have tested positive for WNV.

The unvaccinated horse from York County is currently receiving supportive veterinary care.

Officials reported seven cases of WNV in Wyoming horses residing in Campbell, Fremont, Goshen, Park, and Sheridan counties.