West Nile virus-positive dead birds
by County and City California, 2025

(2026-01-23) - Source: http://westnile.ca.gov

Alameda County
Castro Valley2
Dublin1
Livermore2
Union City1
Total Positives for Alameda County: 6
 
Colusa County
Williams1
Total Positives for Colusa County: 1
 
Contra Costa County
San Ramon1
Walnut Creek2
Total Positives for Contra Costa County: 3
 
Fresno County
Fresno11
Total Positives for Fresno County: 11
 
Kern County
Bakersfield1
Total Positives for Kern County: 1
 
Lake County
Clearlake1
Total Positives for Lake County: 1
 
Los Angeles County
Glendale1
Hawthorne1
Los Angeles1
North Hollywood1
Norwalk1
Total Positives for Los Angeles County: 5
 
Merced County
Gustine1
Total Positives for Merced County: 1
 
Orange County
Garden Grove2
Mission Viejo1
Santa Ana1
Total Positives for Orange County: 4
 
Placer County
Lincoln4
Roseville4
Total Positives for Placer County: 8
 
Sacramento County
Antelope2
Carmichael2
Elk Grove3
Elverta5
Fair Oaks2
Rancho Cordova1
Rio Linda2
Sacramento9
Wilton1
Total Positives for Sacramento County: 27
 
San Diego County
chula vista2
Chula Vista5
La Mesa2
Lemon Grove6
National City1
San Diego16
Santee1
spring Valley1
Total Positives for San Diego County: 34
 
San Joaquin County
Manteca1
Ripon1
Stockton2
Tracy3
Total Positives for San Joaquin County: 7
 
Santa Clara County
Campbell1
Los Altos Hills1
Los Gatos1
Milpitas1
Morgan Hill3
Palo Alto4
San Jose6
Santa Clara3
Saratoga1
Sunnyvale5
Total Positives for Santa Clara County: 26
 
Solano County
Benicia1
Davis1
Dixon1
Total Positives for Solano County: 3
 
Sonoma County
Sonoma1
Total Positives for Sonoma County: 1
 
Stanislaus County
Modesto1
Total Positives for Stanislaus County: 1
 
Sutter County
Yuba City1
Total Positives for Sutter County: 1
 
Tulare County
Visalia8
Total Positives for Tulare County: 8
 
Ventura County
Simi Valley1
Total Positives for Ventura County: 1
 
Yolo County
Davis3
West Sacramento2
Total Positives for Yolo County: 5

Total Positives for all Counties: 155

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