articleThe Brief Maricopa County has recorded 183 positive mosquito samples for the West Nile virus this year. With West Nile cases on the rise in the state, officials with Maricopa County Department of Environmental Services are working to collect data on mosquitoes carrying the disease. So far, they’ve had 183 positive samples for the West Nile Virus. They also have more than 850 traps scattered across Maricopa County, filled with dry ice. Dig deeper:Many of the West Nile cases came early in the year.