West Nile virus was detected this month in mosquitoes and a blood sample from a sentinel chicken flock in Yuma County, Ariz., according to the county's Pest Abatement District. "These two results confirm that transmission of West Nile virus is taking place between birds" in some parts of the county, the district said. While Yuma County had no reported human cases as of Wednesday, Maricopa County has seen two human deaths from the virus and 18 confirmed cases.

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