First discovery of St. Louis encephalitis (SLEV) in mosquitoes. SLEV reemerged in California in 2015 after being undetected for 12 years, and this is the first detection in Los Angeles County for the 2019 mosquito season.

First discovery of St. Louis encephalitis (SLEV) in mosquitoes. SLEV reemerged in California in 2015 after being undetected for 12 years, and this is the first detection in Los Angeles County for the 2019 mosquito season.

Maricopa County in Arizona reported first death this year from West Nile virus (WNV) in an older adult with other health conditions.

The OC Health Care Agency reported the first human case of West Nile virus (WNV) identified this year in Orange County.