ISDA CONFIRMS FIRST CASE OF EQUINE WEST NILE VIRUS THIS YEAR
FOR IMMEDIATE RELEASE
September 2, 2022
Contact: Dr. Scott Leibsle
Dr. Christie Hammons
(208) 332-8540
ISDA CONFIRMS FIRST CASE OF EQUINE WEST NILE VIRUS THIS YEAR
The Idaho State Department of Agriculture’s (ISDA) Animal Health Laboratory confirmed the first case of equine West Nile virus (WNV) in Idaho this year. The affected horse, located in Gooding County, is recovering and is under the treatment of a veterinarian.
The most common signs of WNV in horses are fever and weakness, usually in the hindquarters which sometimes is characterized by a widened stance, stumbling, leaning to one side and toe dragging. Mental conditions such as fearfulness, lip-smacking, chewing movements and fine muscle tremors may be noticed. Paralysis and inability to stand may follow in extreme cases of WNV infection.
West Nile most commonly is spread to people and horses through the bite of an infected mosquito. The public should continue to take precautions in areas with WNV-carrying mosquitoes, and precautions should extend to animals.
The ISDA recommends two essential protections for equines and small camelids: vaccination and physical precautions.
“The WNV vaccination continues to be an essential preventive measure and should be given annually to provide an adequate level of protection from the virus,” said Idaho State Veterinarian Dr. Scott Leibsle. “Nearly 98 percent of horses that test positive for WNV are non-vaccinated or under-vaccinated. Horse owners should speak with their veterinarians about the WNV vaccination and other necessary annual core vaccinations as well as how to follow an annual booster schedule. Horses that have been vaccinated for WNV in previous years must receive annual boosters; a one-time vaccination is not enough.”
Physical WNV precautions include using fans and repellants to keep mosquitoes away from equines. Additionally, horse owners should remove or treat standing water on or near their property whenever possible.
“There is no vaccine for people,” said Dr. Leslie Tengelsen, State Public Health Veterinarian with the Idaho Department of Health and Welfare. “Although most infections in people are mild, some people can become quite ill. Avoid mosquito bites by taking simple precautions.” Precautions can include using insect repellant according to the label, wearing long-sleeved shirts and long pants from dusk to dawn when mosquitoes are most active, and making sure house screens are in working order.
Additional information about the virus and a map of known affected counties is available from the Idaho Department of Health and Welfare’s website, www.westnile.idaho.gov. For questions regarding control of mosquito populations, please contact your local mosquito abatement district.
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