Human Cases
Year-to-date: 2 Counties: 2
There have been 2 new WNV positive human cases reported in California this week from Fresno (1) and Yuba (1) counties. These are the first WNV positive human cases from Fresno and Yuba counties this year.
2 human cases from 2 counties have tested positive for WNV in 2023.
Dead Birds
Year-to-date: 156 Counties: 13
There were 28 new WNV positive dead birds reported in California this week from the following counties: Alameda (3), Butte (3), Contra Costa (1), Los Angeles (2), Riverside (1), Sacramento (3), and Santa Clara (15).
156 dead birds from 13 counties have tested positive for WNV in 2023.
Mosquito Samples
Year-to-date: 583 Counties: 24
There were 140 new WNV positive mosquito samples reported in California this week from the following counties: Alameda (1), Butte (5), Fresno (17), Kern (2), Kings (1), Lake (2), Los Angeles (12), Madera (2), Merced (3), Orange (1), Placer (11), Riverside (9), San Bernardino (11), San Joaquin (22), Santa Clara (3), Shasta (1), Solano (2), Stanislaus (1), Sutter (14), Tulare (4), and Yuba (16). This is the first indication of WNV from Solano and Sutter counties this year.
583 mosquito samples from 24 counties have tested positive for WNV in 2023.
A mosquito sample may contain up to 50 individual mosquitoes.
Sentinel Chickens
Year-to-date: 11 Counties: 4
There were 11 new WNV positive sentinel chickens reported in California this week from the following counties: Butte (1), Contra Costa (5), Lake (2), and Tulare (3). These are the first WNV positive sentinel chickens from Butte, Contra Costa, Lake, and Tulare counties this year.
11 sentinel chickens from 4 counties have tested positive for WNV in 2023.
Horses
Year-to-date: 1 Counties: 1
There was 1 new WNV positive horse reported in California this week from Placer County. This is the first WNV positive horse from Placer County this year.
1 horse from 1 county has tested positive for WNV in 2023.