2021 WNV Activity by County

(2021-01-24) - Source: http://westnile.ca.gov

Total Positive Counties: 40

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals197343262814420
Alameda-8---
Alpine-1---
Amador----2
Butte4428231
Calaveras---2-
Colusa-----
Contra Costa422137-
Del Norte-----
El Dorado1----
Fresno105322--
Glenn1-321
Humboldt-----
Imperial--3--
Inyo-----
Kern7-83--
Kings1-87-1
Lake--122-
Lassen-----
Los Angeles7210243738-
Madera6-77--
Marin-1---
Mariposa-----
Mendocino-----
Merced12242141
Modoc----1
Mono-----
Monterey-----
Napa-12--
Nevada----1
Orange1647326--
Placer2358--
Plumas-----
Riverside5264-2
Sacramento19111541
San Benito---1-
San Bernardino2-13-1
San Diego112--
San Francisco-----
San Joaquin14260-4
San Luis Obispo-----
San Mateo-1---
Santa Barbara--1--
Santa Clara-78--
Santa Cruz-----
Shasta2-253-
Sierra-----
Siskiyou-----
Solano13841
Sonoma-----
Stanislaus354351-3
Sutter1-2026-
Tehama2--5-
Trinity-----
Tulare7518910-
Tuolumne-----
Ventura---1-
Yolo329771-
Yuba--21-
State Totals197343262814420