The Oklahoma Department of Agriculture, Food and Forestry is encouraging horse owners across the state to take precautions against West Nile virus and Eastern Equine Encephalitis by vaccinating their horses. After the recent rainfall, there is a possibility mosquitos will be more prevalent.

West Nile Virus is a zoonotic disease spread by mosquitoes and thought to cycle between mosquitoes and birds. Mosquitoes contract the virus from birds and then spread it to mammals (and reptiles)—most commonly humans and horses. Infected horses can become anorexic, depressed and show neurologic signs or behavior changes. The incubation period in horses is between three and 15 days. Many infected horses are asymptomatic. Clinical signs can be similar to those seen with other neurologic diseases including rabies. There are multiple vaccination options available; please visit with your veterinarian to determine which vaccination option best fits your operation.

Oklahomans can reduce the risk of both EEE and WNV by eliminating standing water which serves as a breeding area for mosquitos. Disease risk can be reduced by limiting exposure to mosquitoes with these common practices: changing horses’ drinking water regularly, mowing tall grass, draining stagnant water, maintaining screens, installing fans at horse stables, and using insect repellants on both horses and people. Also, mosquitoes primarily feed at dawn and dusk, and keeping horses indoors during these times can reduce risk.

ODAFF also recommends vaccinating horses against equine herpesvirus and equine influenza. Lastly, vaccinations for tetanus and rabies are vital for horses, as they do not need to be around other horses to be susceptible to these diseases.

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