California West Nile cases rise by 21 in past week, Butte County hit hardest

California health officials have confirmed an additional 21 human West Nile virus (WNV) cases during the past week, bring the state's total to 57 this year from 13 counties to date. The new cases were reported from the following counties: Butte (14), Glenn (2), Lake (1), Mendocino (1), Nevada (1), and Tehama (2). Butte County, located in ["]