2015 WNV Activity by County
Year To Date (Weeks 1 - 43)

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

Total Positive Counties: 40

CountyHuman CasesDead BirdsMosquito SamplesSentinel ChickensHorses
State Totals508122132053850
Alameda-1814--
Alpine-----
Amador-----
Butte53389437-
Calaveras-----
Colusa13-10-
Contra Costa111818-
Del Norte-----
El Dorado-4---
Fresno73108--
Glenn1942110-
Humboldt-2---
Imperial-----
Inyo-----
Kern111135--
Kings-3144--
Lake25314-
Lassen-----
Los Angeles1185924299-
Madera4121--
Marin13---
Mariposa-----
Mendocino1----
Merced13821-
Modoc-----
Mono-----
Monterey-----
Napa-7---
Nevada210-4-
Orange5770522--
Placer-21528-
Plumas-----
Riverside1007715416-
Sacramento21031642-
San Benito-----
San Bernardino402528226-
San Diego28295459-
San Francisco-----
San Joaquin218207--
San Luis Obispo-----
San Mateo-215--
Santa Barbara-31--
Santa Clara7229195-
Santa Cruz-----
Shasta3164822-
Sierra-----
Siskiyou1----
Solano11067-
Sonoma-1112--
Stanislaus1214849-
Sutter2165436-
Tehama5--18-
Trinity-2---
Tulare722528--
Tuolumne-----
Ventura526-7-
Yolo7611736-
Yuba862311-
State Totals508122132053850