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

(2025-07-14) - Source: http://westnile.ca.gov

Alameda County
Castro Valley2
Livermore2
Union City1
Total Positives for Alameda County: 5
 
Fresno County
Fresno4
Total Positives for Fresno County: 4
 
Kern County
Bakersfield1
Total Positives for Kern County: 1
 
Sacramento County
Antelope2
Carmichael1
Elk Grove1
Sacramento1
Total Positives for Sacramento County: 5
 
San Diego County
La Mesa1
Lemon Grove3
San Diego4
Total Positives for San Diego County: 8
 
San Joaquin County
Stockton1
Tracy1
Total Positives for San Joaquin County: 2
 
Santa Clara County
Los Altos Hills1
Milpitas1
Morgan Hill1
Palo Alto3
San Jose1
Santa Clara2
Sunnyvale5
Total Positives for Santa Clara County: 14
 
Tulare County
Visalia5
Total Positives for Tulare County: 5

Total Positives for all Counties: 44

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