Of 3,143 counties across the reporting jurisdictions, 591, or 19%, reported at least one West Nile case. Three-quarters of West Nile cases involved neuroinvasive disease, meaning the virus reached the brain or spinal cord. Wear long sleeves and long pants during dawn and dusk hours when the Culex mosquitoes that carry West Nile are most active. Nationally notifiable domestic arboviruses include West Nile, Powassan, La Crosse, Jamestown Canyon, eastern equine encephalitis, and St. Louis encephalitis. Which state had the most West Nile cases?