The Denver Department of Public Health and Environment announced Monday that the city's first human case of West Nile virus this season has been confirmed. Officials in Jefferson County have also confirmed their first human cases of the virus,

City health officials on Monday urged Denverites to take precautions against mosquitoes after confirming the first case of West Nile virus in a Denver resident this week.

Eleven people in Colorado have tested positive for West Nile this year, including five who developed neurologic symptoms and three who needed hospital care. One person died from the virus.