In this photo taken Thursday, Aug. 13, 2015, Reyes Murrieta, a Colorado State University graduate research assistant, tests mosquitos for the West Nile virus in Fort Collins, Colo.
In this photo taken Thursday, Aug. 13, 2015, Reyes Murrieta, a Colorado State University graduate research assistant, tests mosquitos for the West Nile virus in Fort Collins, Colo. Erin Hull The Coloradoan via AP
In this photo taken Thursday, Aug. 13, 2015, Reyes Murrieta, a Colorado State University graduate research assistant, tests mosquitos for the West Nile virus in Fort Collins, Colo. Erin Hull The Coloradoan via AP