Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2019
Year To Date (Weeks 1 - 29)

(2019-07-22) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda12532--
Alpine----
Amador3---
Butte4115--
Calaveras7---
Colusa51--
Contra Costa20216--
Del Norte----
El Dorado3412--
Fresno1777457%
Glenn1---
Humboldt32--
Imperial1---
Inyo14---
Kern13---
Kings7---
Lake81--
Lassen1---
Los Angeles3094337%
Madera6---
Marin283--
Mariposa----
Mendocino6---
Merced143133%
Modoc----
Mono1---
Monterey173--
Napa201--
Nevada21--
Orange23718984%
Placer11361--
Plumas2---
Riverside7722--
Sacramento39616411%
San Benito2---
San Bernardino5411--
San Diego1026811%
San Francisco273--
San Joaquin8721314%
San Luis Obispo183--
San Mateo14931--
Santa Barbara142--
Santa Clara287101--
Santa Cruz5612--
Shasta9---
Sierra----
Siskiyou1---
Solano337--
Sonoma384--
Stanislaus736--
Sutter317--
Tehama6---
Trinity----
Tulare6415747%
Tuolumne5---
Ventura473--
Yolo9938--
Yuba203--
State Totals3092911283%

* 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