Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2019
Year To Date (Weeks 1 - 37)

(2019-09-19) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda16532--
Alpine----
Amador4---
Butte5719--
Calaveras7---
Colusa71--
Contra Costa2582115%
Del Norte----
El Dorado4213--
Fresno309141071%
Glenn3---
Humboldt63--
Imperial1---
Inyo14---
Kern2022100%
Kings13---
Lake102--
Lassen1---
Los Angeles485861821%
Madera8---
Marin364--
Mariposa1---
Mendocino7---
Merced344250%
Modoc----
Mono1---
Monterey194--
Napa221--
Nevada32--
Orange435324206%
Placer1468833%
Plumas2---
Riverside9928--
Sacramento5932873813%
San Benito31--
San Bernardino8617318%
San Diego1298311%
San Francisco353--
San Joaquin11629517%
San Luis Obispo203--
San Mateo18543--
Santa Barbara192--
Santa Clara365116--
Santa Cruz6914--
Shasta14---
Sierra----
Siskiyou1---
Solano4410--
Sonoma455--
Stanislaus1178113%
Sutter449--
Tehama6---
Trinity----
Tulare113271659%
Tuolumne1011100%
Ventura698--
Yolo1315324%
Yuba318338%
State Totals446013751269%

* 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