State Agriculture officials say a horse that raced last month at a Genesee County track has tested positive for equine herpes virus.
MLive.com reports Friday that the horse displayed symptoms of the virus after a Dec. 22 race at Sports Creek Raceway in Swartz Creek, southwest of Flint.
State veterinarian Steven Halstead says the horse "was visibly ill to the owner on Dec. 23."
Tests confirmed the horse had contracted the virus. It later was quarantined at a private stable.
The disease poses no harm to humans but can cause abortions, partial paralysis and death in horses. It can spread through bodily fluids or direct contact with objects touched by an infected horse.