MERCER COUNTY -- Two horses that died on a Mercer County farm tested positive for Eastern equine encephalitis, the Ohio Department of Agriculture announced Thursday.
The Department of Agriculture said itís the first outbreak in Ohio since 1991. The virus is transmitted by mosquitoes. The virus can infect birds and in rare cases humans.
Symptoms in infected horses include paralysis, impaired vision, difficulty swallowing, hanging their heads and grinding their teeth, the Department of Agriculture said.
Suspected cases should be reported to the Ohio Department of Agriculture.