2013 WNV Activity by County
Year To Date (Weeks 1 - 33)

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

Total Positive Counties: 38

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals3770913491768
Alameda-8---
Alpine-----
Amador-----
Butte1252530-
Calaveras-----
Colusa11-6-
Contra Costa1394--
Del Norte-----
El Dorado-----
Fresno2737--
Glenn36146-
Humboldt-1---
Imperial-----
Inyo-----
Kern228111
Kings-1050--
Lake-6301-
Lassen-----
Los Angeles1520222348-
Madera-712--
Marin-2-1-
Mariposa-----
Mendocino-1---
Merced-2667-
Modoc-----
Mono-----
Monterey-----
Napa-----
Nevada-3---
Orange1129--
Placer-197141
Plumas-----
Riverside21345111
Sacramento211023923
San Benito-----
San Bernardino-101178-
San Diego-5---
San Francisco-----
San Joaquin22576--
San Luis Obispo--1--
San Mateo-----
Santa Barbara-----
Santa Clara13417--
Santa Cruz-1---
Shasta-1835-
Sierra-----
Siskiyou-----
Solano1614-
Sonoma-7---
Stanislaus183352
Sutter-145822-
Tehama-2-1-
Trinity-1---
Tulare-318--
Tuolumne-1---
Ventura16---
Yolo1611685-
Yuba-7119-
State Totals3770913491768