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West Nile vaccination recommended for horses
Colorado
While some speculate the Western Slope may be hardest hit this year by West Nile virus, one thing remains clear: Horse owners across the state should vaccinate their animals.
"Last year alone, Colorado led the nation with 604 horses testing positive for the disease," stated Colorado State Veterinarian Wayne Cunningham. "Vaccination and controlling mosquito populations are still the most effective tools in preventing West Nile virus in horses, but owners with questions should discuss it with their local veterinarians."
Horses that have been vaccinated in past years will need an annual booster shot this spring. However, if an owner did not vaccinate their animal in previous years, the horse will need the two-shot vaccination series within a three to six week period. Statistics show that of the unvaccinated horses exhibiting clinical signs from the infection, one in three will most likely die.
Humans, horses and companion animals will benefit if owners control mosquito populations on their property. Officials recommend eliminating standing pools of water where mosquitoes breed and using mosquito larvacide products. Owners should also keep their animals inside during the morning and evening hours when mosquitoes are most likely to be active.
"Unfortunately, there is no WNV vaccination at this time for companion animals such as cats and dogs," said Cunningham DVM. "They are also susceptible to the disease and concerned owners should consult with their veterinarians if their pets are exhibiting unusual symptoms."
West Nile virus can cause an inflammation of the brain and spinal cord and was first discovered in the United States in September of 1999 in a dead bird. Mosquitoes transmit the disease and infected horses may display symptoms including head tilt, muscle tremors, stumbling, lack of coordination, weakness of the limbs or partial paralysis.
The Department's Rocky Mountain Regional Animal Health Laboratory can test equine serum for West Nile virus. The fee is $5.75 per sample with results within 48 hours. Samples must be sent to CDA-RMRAHL, 2331 W. 31st Ave., Denver, CO, 80211.
For more information on West Nile virus, visit the Internet at www.ag.state.co.us or the U.S. Department of Agriculture's website at www.aphis.usda.gov/oa/wnv/index.html.
Date: 4/5/04
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