2015 WNV Activity by County
Year To Date (Weeks 1 - 25)

(2024-03-28) - Source: http://westnile.ca.gov

Total Positive Counties: 31

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals010218030
Alameda-2---
Alpine-----
Amador-----
Butte-11--
Calaveras-----
Colusa-----
Contra Costa--2--
Del Norte-----
El Dorado-1---
Fresno--3--
Glenn-1---
Humboldt-----
Imperial-----
Inyo-----
Kern--7--
Kings--6--
Lake-----
Lassen-----
Los Angeles-22--
Madera-1---
Marin-1---
Mariposa-----
Mendocino-----
Merced--1--
Modoc-----
Mono-----
Monterey-----
Napa-----
Nevada-----
Orange-13--
Placer---2-
Plumas-----
Riverside-456--
Sacramento-51--
San Benito-----
San Bernardino-11--
San Diego-333--
San Francisco-----
San Joaquin-13--
San Luis Obispo-----
San Mateo-3---
Santa Barbara--1--
Santa Clara-21---
Santa Cruz-----
Shasta-211-
Sierra-----
Siskiyou-----
Solano-1---
Sonoma-2---
Stanislaus-4---
Sutter-2---
Tehama-----
Trinity-----
Tulare-883--
Tuolumne-----
Ventura-1---
Yolo-33--
Yuba-13--
State Totals010218030