2021 WNV Activity by County

(2022-08-10) - Source: http://westnile.ca.gov

Total Positive Counties: 39

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals12921022639013
Alameda-2---
Alpine-----
Amador----1
Butte1328027-
Calaveras-----
Colusa---1-
Contra Costa248--
Del Norte-----
El Dorado1----
Fresno14-219-2
Glenn2----
Humboldt-----
Imperial-----
Inyo-----
Kern8-103--
Kings8-34-1
Lake--44-
Lassen-----
Los Angeles16432603-
Madera3-131--
Marin-----
Mariposa-----
Mendocino-----
Merced6110191
Modoc-----
Mono-----
Monterey-----
Napa--1--
Nevada-2---
Orange3751--
Placer2563--
Plumas-----
Riverside3-112--
Sacramento610012012
San Benito-----
San Bernardino119--
San Diego31---
San Francisco1----
San Joaquin717389-3
San Luis Obispo2----
San Mateo1----
Santa Barbara2----
Santa Clara314--
Santa Cruz1----
Shasta3-283-
Sierra-----
Siskiyou-----
Solano2222--
Sonoma-12--
Stanislaus52152-1
Sutter-11811-
Tehama---5-
Trinity-----
Tulare8737510-
Tuolumne-----
Ventura-1---
Yolo310564-
Yuba--1222
State Totals12921022639013