West Nile Virus — United States
As of 14 Sep 2015, 11 equine cases of West Nile virus (WNV) have been diagnosed in 9 Colorado counties. The WNV positive horses are from Alamosa, Boulder, Broomfield, Conejos, Fremont, Jefferson, Larimer, Park, and Weld counties.
The incidence of WNV disease varies from year to year and depends on a number of factors, including the amount of mosquitoes. The West Nile virus can be carried by infected birds and then spread locally by mosquitoes that bite those birds. The mosquitoes can then
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