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First West Nile Virus-Positive Horse Identified in Missaukee County

Mosquitoes will continue to be active until there has been a hard freeze; take precautions to protect your animals, yourself, and your family 

LANSING, Mich. —The Michigan Department of Agriculture and Rural Development (MDARD) confirmed the state’s first detection of West Nile virus (WNV) in a three-year-old standardbred-Friesian mare from Missaukee County. This is the first case of West Nile virus reported in a domestic animal for 2026. The mare is currently responding to medical treatment and is believed to be unvaccinated.

“Despite the recent cooler nightly temperatures being experienced around Michigan, the mosquitoes carrying diseases like WNV, eastern equine encephalitis (EEE) and other mosquito-borne diseases will remain alive and active until there has been at least one hard freeze where the temperatures fall below 28 degrees Fahrenheit,” said State Veterinarian Nora Wineland, DVM, MS, DACVPM. “Until this hard freeze happens, it’s important Michiganders continue taking all possible precautions to keep mosquitoes away from animals, themselves and their families.”

West Nile virus is a viral disease transmitted through the bite of an infected mosquito. While the disease typically affects horses, humans, and birds, it can sometimes cause illness in other animals. The disease is not spread by horse-to-horse or horse-to-human contact. Cases of WNV are typically seen in the late summer through early fall each year in Michigan. 

Placing livestock in a barn under fans during peak mosquito activity (from dusk to dawn), eliminating standing water on one’s property, using an insect repellant on animals approved for the species, and contacting a veterinarian to vaccinate horses against West Nile virus and other mosquito-borne diseases are all vital measures to take in order to keep animals healthy.

Also, please contact a veterinarian if a horse shows signs of illness: mild fever and stumbling, which can progress to being down and struggling to stand. If a Michigan animal is suspected of having West Nile virus, funding may available under an arbovirus grant to cover the testing costs. Please contact MDARD at 800-292-3939 for more details. 

For more information about WNV, please visit Michigan.gov/EmergingDiseases

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