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First Human West Nile Cases Confirmed in Massachusetts and Delaware County as Mosquito Positives Surge

Health officials say elevated mosquito activity will keep infection risk high until the first hard frost.

Chicago Elevates West Nile Risk to High After First Human Cases Confirmed

West Nile Virus Confirmed in Massachusetts Goat as Illinois Reports Second Human Case

CDC Ends H5N1 Bird Flu Emergency, Moves Oversight Into Routine Flu Surveillance

West Nile Virus Detected in Mosquitoes Across McHenry and DuPage Counties