Benton County Mosquito Control regularly traps and tests mosquitoes for West Nile virus. Mosquitoes collected near Prosser and Mabton tested positive for the virus this week. This is the first indication of disease activity for Benton County this season, and the fifth positive sample within the Benton County Mosquito Control District. All positive samples were collected in the Prosser, Grandview and Mabton areas. "This is the time of year when disease transmission from mosquitoes to people, birds and horses is the highest. It is extremely important that people wear repellent when outdoors over the next few weeks," said Angela Beehler, Benton County Mosquito Control manager. It only takes one mosquito bite to transmit the disease. The hot, dry weather conditions provide a perfect environment for the disease to flourish. Benton County Mosquito Control conducted aerial spraying today (Thursday) near Prosser, Mabton and Grandview.