Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2017
Year To Date (Weeks 1 - 21)

(2017-05-29) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda8911--
Alpine----
Amador2---
Butte181--
Calaveras----
Colusa----
Contra Costa1416--
Del Norte----
El Dorado162--
Fresno491--
Glenn----
Humboldt2---
Imperial1---
Inyo1---
Kern27---
Kings141--
Lake42--
Lassen----
Los Angeles2141517%
Madera51--
Marin192--
Mariposa1---
Mendocino5---
Merced7---
Modoc----
Mono----
Monterey81--
Napa122--
Nevada3---
Orange19410111%
Placer6832--
Plumas1---
Riverside496--
Sacramento2725647%
San Benito4---
San Bernardino366--
San Diego732514%
San Francisco11---
San Joaquin5513--
San Luis Obispo8---
San Mateo1182115%
Santa Barbara124--
Santa Clara15315--
Santa Cruz223--
Shasta16---
Sierra1---
Siskiyou----
Solano225--
Sonoma334--
Stanislaus587--
Sutter92--
Tehama6---
Trinity----
Tulare213--
Tuolumne1---
Ventura603--
Yolo468--
Yuba81--
State Totals199536082%

* 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