Kentucky Agriculture Commissioner James Comer issued a warning today that weather conditions are ripe for an outbreak of West Nile Virus. And he says horse owners should consult their veterinarians about vaccinating their horses against the disease. West Nile is spread by mosquitoes, and mosquitoes thrive in the warm, wet conditions the state has experienced in the last few weeks. Officials say no horse in Kentucky that has undergone a full West Nile vaccination regimen is known to have contracted the virus since 2003.