2013 WNV Activity by County
Year To Date (Weeks 1 - 47)

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

Total Positive Counties: 44

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals3561246252748413
Alameda-20---
Alpine-----
Amador-----
Butte23423357-
Calaveras-----
Colusa21-8-
Contra Costa5681371
Del Norte-----
El Dorado1----
Fresno61266--
Glenn98169-
Humboldt-1---
Imperial-----
Inyo-----
Kern242181122
Kings11278--
Lake-10626-
Lassen-----
Los Angeles146313417151-
Madera37162-
Marin27-1-
Mariposa-----
Mendocino-2---
Merced-39821-
Modoc-----
Mono-----
Monterey-----
Napa12---
Nevada-6-2-
Orange94248--
Placer53989133
Plumas-----
Riverside352281431
Sacramento1017938463
San Benito---11
San Bernardino133724829-
San Diego-9---
San Francisco1----
San Joaquin734163--
San Luis Obispo-11--
San Mateo-----
Santa Barbara1----
Santa Clara274252-
Santa Cruz-11--
Shasta1381521-
Sierra-----
Siskiyou1----
Solano115112-
Sonoma-3752-
Stanislaus161315882
Sutter10166135-
Tehama13-8-
Trinity-1---
Tulare47975-
Tuolumne-1---
Ventura28---
Yolo610624612-
Yuba8111411-
State Totals3561246252748413