West Nile virus-positive dead birds
by County and City California, 2026

(2026-08-14) - Source: http://westnile.ca.gov

Alameda County
Castro Valley1
Fremont3
Livermore1
Newark25
Pleasanton1
Union City1
Total Positives for Alameda County: 32
 
Contra Costa County
Brentwood2
Concord1
El Cerrito4
Walnut Creek1
Total Positives for Contra Costa County: 8
 
Fresno County
Fresno3
Total Positives for Fresno County: 3
 
Los Angeles County
Artesia1
Burbank3
Cerritos12
Culver City1
Downey1
Lakewood5
La Mirada3
Long Beach14
Los Angeles12
Monrovia1
Montebello1
North Hollywood1
Northridge1
Norwalk2
Pacoima1
Porter Ranch1
San Fernando1
San Pedro1
Santa Monica2
South Gate1
Sylmar1
Torrance3
Whittier1
Total Positives for Los Angeles County: 70
 
Madera County
Madera2
Total Positives for Madera County: 2
 
Merced County
Atwater1
Total Positives for Merced County: 1
 
Napa County
Napa1
Total Positives for Napa County: 1
 
Orange County
Fullerton1
Orange1
Total Positives for Orange County: 2
 
Placer County
Granite Bay1
Lincoln1
Roseville2
Total Positives for Placer County: 4
 
Riverside County
Eastvale1
Murrieta1
Total Positives for Riverside County: 2
 
Sacramento County
Antelope1
Carmichael7
Citrus Heights4
Elk Grove3
ELk Grove1
Elverta1
Fair Oaks4
Folsom1
Mcclellan1
Rancho Cordova7
Rancho Murieta1
Rio Linda1
Sacramento53
Total Positives for Sacramento County: 85
 
San Bernardino County
Chino1
Colton2
Highland2
Rialto2
Victorville1
Total Positives for San Bernardino County: 8
 
San Diego County
chula vista1
Chula Vista2
El Cajon1
La Mesa7
san diego1
San Diego14
Total Positives for San Diego County: 26
 
San Joaquin County
Manteca1
Stockton3
Total Positives for San Joaquin County: 4
 
San Mateo County
Atherton2
Menlo Park7
Total Positives for San Mateo County: 9
 
Santa Clara County
Campbell6
Los Altos4
Milpitas1
Morgan Hill1
Mountain View5
Palo Alto21
San Jose17
Santa Clara15
Sunnyvale4
Total Positives for Santa Clara County: 74
 
Solano County
Fairfield1
Vallejo1
Total Positives for Solano County: 2
 
Sutter County
Live Oak1
Yuba City2
Total Positives for Sutter County: 3
 
Ventura County
Ventura2
Westlake Village1
Total Positives for Ventura County: 3
 
Yolo County
Davis3
West Sacramento1
Woodland5
Total Positives for Yolo County: 9
 
Yuba County
Plumas Lake2
Total Positives for Yuba County: 2

Total Positives for all Counties: 350

Source: Vector-Borne Disease Section, California Department of Public Health