2013 WNV Activity by County
Year To Date (Weeks 1 - 42)

(2024-03-29) - Source: http://westnile.ca.gov

Total Positive Counties: 42

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals2721198248946311
Alameda-18---
Alpine-----
Amador-----
Butte22423357-
Calaveras-----
Colusa21-8-
Contra Costa4681371
Del Norte-----
El Dorado1----
Fresno51166--
Glenn88169-
Humboldt-1---
Imperial-----
Inyo-----
Kern182181122
Kings-1278--
Lake-10616-
Lassen-----
Los Angeles110307400138-
Madera37162-
Marin27-1-
Mariposa-----
Mendocino-2---
Merced-39821-
Modoc-----
Mono-----
Monterey-----
Napa12---
Nevada-6-2-
Orange43345--
Placer53889131
Plumas-----
Riverside252280411
Sacramento317538363
San Benito----1
San Bernardino53723628-
San Diego-6---
San Francisco1----
San Joaquin634162--
San Luis Obispo-11--
San Mateo-----
Santa Barbara-----
Santa Clara265252-
Santa Cruz-11--
Shasta-371520-
Sierra-----
Siskiyou-----
Solano115112-
Sonoma-2851-
Stanislaus161315882
Sutter10166135-
Tehama-3-8-
Trinity-1---
Tulare47955-
Tuolumne-1---
Ventura28---
Yolo610324610-
Yuba6111411-
State Totals2721198248946311