2025 SLEV Activity by County

(2025-04-18) - Source: http://westnile.ca.gov

CountyHuman CasesMosquito SamplesSentinel Chickens
State Totals000
Alameda---
Alpine---
Amador---
Butte---
Calaveras---
Colusa---
Contra Costa---
Del Norte---
El Dorado---
Fresno---
Glenn---
Humboldt---
Imperial---
Inyo---
Kern---
Kings---
Lake---
Lassen---
Los Angeles---
Madera---
Marin---
Mariposa---
Mendocino---
Merced---
Modoc---
Mono---
Monterey---
Napa---
Nevada---
Orange---
Placer---
Plumas---
Riverside---
Sacramento---
San Benito---
San Bernardino---
San Diego---
San Francisco---
San Joaquin---
San Luis Obispo---
San Mateo---
Santa Barbara---
Santa Clara---
Santa Cruz---
Shasta---
Sierra---
Siskiyou---
Solano---
Sonoma---
Stanislaus---
Sutter---
Tehama---
Trinity---
Tulare---
Tuolumne---
Ventura---
Yolo---
Yuba---
State Totals000