(Undated) -- More than 200 cases of West Nile Virus have been identified in mosquitoes across the midstate.

State Department of Environmental Protection spokesman Kevin Sunday says efforts are being stepped up to control the mosquito population. He says the weather has not been helping. "Any time we have more rainfall, we're going to see more stagnant water across the state, and that's going to provide more breeding ground for mosquitoes," Sunday says.

Tom Smith is the coordinator for the Penn State Cooperative Extension York County West Nile Virus Program. He says people need to check their yards for items that collect water where mosquitoes can breed. "Many times people have things sitting behind a shed that they've forgotten about," Smith says. "A five gallon bucket can produce many thousands of mosquitoes during a summer."

Smith says York County alone has had more than 60 confirmed cases of the virus in mosquitoes this year. No humans in Pennsylvania have tested positive for West Nile Virus this year.