2015 WNV Activity by County
Year To Date (Weeks 1 - 38)

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

Total Positive Counties: 40

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals23396927693140
Alameda-173--
Alpine-----
Amador-----
Butte45389437-
Calaveras-----
Colusa13-10-
Contra Costa-8614-
Del Norte-----
El Dorado-3---
Fresno43100--
Glenn194218-
Humboldt-2---
Imperial-----
Inyo-----
Kern51135--
Kings-3139--
Lake25304-
Lassen-----
Los Angeles393816362-
Madera2120--
Marin13---
Mariposa-----
Mendocino1----
Merced-2817-
Modoc-----
Mono-----
Monterey-----
Napa-7---
Nevada210-3-
Orange2144353--
Placer-20498-
Plumas-----
Riverside286413814-
Sacramento1881471-
San Benito-----
San Bernardino152322425-
San Diego42078--
San Francisco-----
San Joaquin216198--
San Luis Obispo-----
San Mateo-145--
Santa Barbara--1--
Santa Clara5179195-
Santa Cruz-----
Shasta2154819-
Sierra-----
Siskiyou1----
Solano-956-
Sonoma-711--
Stanislaus913749-
Sutter2165435-
Tehama4--18-
Trinity-2---
Tulare422524--
Tuolumne-----
Ventura119-5-
Yolo6571693-
Yuba762311-
State Totals23396927693140