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(Undated) -- Mosquitoes carrying West Nile Virus are being found in Iowa. Iowa State University researchers say mosquitoes in four counties have tested positive for the virus. They say the kind of mosquitoes that carry West Nile Virus are more common this time of summer. The Centers for Disease Control says about one-in-five people infected with West Nile Virus will develop flu-like symptoms. Most people will recover completely.