Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2017
Year To Date (Weeks 1 - 17)

(2017-04-30) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda435--
Alpine----
Amador----
Butte9---
Calaveras----
Colusa----
Contra Costa661--
Del Norte----
El Dorado7---
Fresno25---
Glenn----
Humboldt2---
Imperial1---
Inyo----
Kern17---
Kings31--
Lake2---
Lassen----
Los Angeles1173--
Madera1---
Marin13---
Mariposa----
Mendocino1---
Merced2---
Modoc----
Mono----
Monterey4---
Napa----
Nevada3---
Orange1123613%
Placer4021--
Plumas----
Riverside26---
Sacramento124---
San Benito2---
San Bernardino13---
San Diego451417%
San Francisco9---
San Joaquin265--
San Luis Obispo3---
San Mateo601517%
Santa Barbara83--
Santa Clara914--
Santa Cruz192--
Shasta4---
Sierra----
Siskiyou----
Solano11---
Sonoma112--
Stanislaus25---
Sutter61--
Tehama3---
Trinity----
Tulare7---
Tuolumne----
Ventura37---
Yolo28---
Yuba5---
State Totals103111333%

* Birds in a die-off are not included in reported totals because the deaths are not related to WNV. A die-off is defined as a group of 10 or more same species dead birds unless the species is American Crow.
Source: Vector-Borne Disease Section, California Department of Public Health