The Kentucky State Veterinarian’s office has announced that two horses—one from Logan County and one in Union County—have tested positive for West Nile virus (WNV).

These are the fifth and sixth equine WNV cases confirmed in the commonwealth this year, Kentucky Equine Programs manager E.S. "Rusty" Ford said in a statement.

In Logan County, a 10-year-old Belgian mare with no WNV vaccination history began displaying signs of disease—including lethargy, mild ataxia (incoordination, predominantly in the hind limbs) and inappetence—on Oct. 31. As of Nov. 3, the attending veterinarian reported the mare was showing signs of improvement.

In Union County, a 2-year-old American Saddlebred colt with no WNV vaccination history began exhibiting muscle fasciculation (twitching) and mild ataxia on Oct. 31. As of Nov. 11, the colt was reported to be in a stable condition.

In his statement, Ford said none of the six Kentucky horses that contracted WNV had been vaccinated.

[brightcove videoid="3151235477001" title="Health Alert: West Nile Virus"]

West Nile is transmitted to horses via bites from infected mosquitoes. Clinical signs for WNV include flulike signs, where the horse seems mildly anorexic and depressed; fine and coarse muscle and skin fasciculation; hyperesthesia (hypersensitivity to touch and sound); changes in mentation (mentality), when horses look like they are daydreaming or "just not with it"; occasional somnolence (drowsiness); propulsive walking (driving or pushing forward, often without control); and "spinal" signs, including asymmetrical weak