Wet Spring, High Mosquito Numbers Could Mean More WNV

Horse owners should take steps to protect their animals, including vaccinating and implementing insect control measures.
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Scientists at Colorado State University (CSU) have detected a notably high number of Culex mosquitoes in northern Colorado this season, which could translate into high infection rates of West Nile virus (WNV). But so far there is no indication that the virus is spreading quickly from mosquito populations to birds, horses, or people.

A wet spring and summer and the resulting large mosquito population create high potential for the spread of the virus, but to date it has turned up in only a small number of mosquito samples, CSU experts say.

Still, public health agencies advise precautions. Key steps include draining standing water around your yard, garden, and farm; wearing long sleeves and pants, especially from dusk through dawn, when mosquitoes are most active; and using insect repellent with DEET.

The year’s first human case of the disease in Colorado was detected in a Mesa County man on July 8. On July 24, the CSU Veterinary Diagnostic Laboratories confirmed the state’s first two equine cases of West Nile virus, in horses from Boulder County and Alamosa County

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