Human Cases
Year-to-date: 343 Counties: 35
There were 19 new WNV positive human cases reported in California last week from the following counties: Alameda (1), El Dorado (1), Fresno (1), Kings (1), Los Angeles (6), Orange (1), Riverside (3), Sacramento (2), San Bernardino (1), Solano (1), and Sonoma (1). These are the first WNV positive human cases from Alameda and Sonoma counties this year.
11 WNV-related fatalities have been reported to CDPH this year from 9 jurisdictions: El Dorado (1), Kern (1), Lake (1), Los Angeles (1), Placer (1), Sacramento (1), San Bernardino (2), Stanislaus (1), Yolo (2).
343 human cases from 35 counties have tested positive for WNV in 2023.
Dead Birds
Year-to-date: 849 Counties: 31
There was 1 new WNV positive dead bird reported in California last week from Sacramento County.
849 dead birds from 31 counties have tested positive for WNV in 2023.
Mosquito Samples
Year-to-date: 4,512 Counties: 31
There were 10 new WNV positive mosquito samples reported in California last week from the following counties: Los Angeles (9), and Orange (1).
4,512 mosquito samples from 31 counties have tested positive for WNV in 2023.
A mosquito sample may contain up to 50 individual mosquitoes.
Sentinel Chickens
Year-to-date: 187 Counties: 17
There were 2 new WNV positive sentinel chickens reported in California last week from Los Angeles County.
187 sentinel chickens from 17 counties have tested positive for WNV in 2023.
Horses
Year-to-date: 31 Counties: 20
31 horses from 20 counties have tested positive for WNV in 2023.