West Nile Virus Confirmed in Michigan Horse

The Michigan Department of Agriculture and Rural Development has confirmed the state's first detection of West Nile virus (WNV) in a 3-year-old horse. The affected animal, a standardbred-Friesian mare from Missaukee County, is currently undergoing treatment and is believed to be unvaccinated.

State Veterinarian Nora Wineland stated that mosquitoes carrying diseases like WNV remain active until temperatures drop below 28 degrees Fahrenheit for a hard freeze. She urged residents to take precautions to protect animals and families from mosquito-borne illnesses before this occurs.

WNV is transmitted solely through infected mosquito bites and does not spread between horses or from horses to humans. The disease typically affects horses, humans, and birds, with Michigan seeing cases from late summer through early fall.

Preventative measures recommended by the MDARD include housing livestock in barns with fans during peak mosquito hours (dusk to dawn), eliminating standing water, using approved insect repellents, and vaccinating horses against mosquito-borne diseases. Owners should consult a veterinarian if their horse exhibits symptoms like fever or stumbling.

In humans, WNV often causes no symptoms or mild flu-like illness. However, in some cases, it can lead to severe brain inflammation. Individuals over 50 are at higher risk for serious complications. Protective measures include limiting outdoor activity at dusk and dawn, maintaining screens, and wearing protective clothing.