Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2019
Year To Date (Weeks 1 - 45)

(2019-11-12) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda20332--
Alpine----
Amador4---
Butte642115%
Calaveras8---
Colusa71--
Contra Costa2992314%
Del Norte----
El Dorado4514--
Fresno334161063%
Glenn3---
Humboldt74--
Imperial1---
Inyo14---
Kern2522100%
Kings15---
Lake102--
Lassen2---
Los Angeles6451414532%
Madera9---
Marin505--
Mariposa1---
Mendocino7---
Merced375360%
Modoc----
Mono1---
Monterey214--
Napa251--
Nevada43--
Orange5754414610%
Placer17310333%
Plumas2---
Riverside11235411%
Sacramento7183174414%
San Benito31--
San Bernardino9920420%
San Diego1529722%
San Francisco424--
San Joaquin13033515%
San Luis Obispo213--
San Mateo22153--
Santa Barbara212--
Santa Clara41814086%
Santa Cruz8618--
Shasta1811100%
Sierra----
Siskiyou1---
Solano5211--
Sonoma526--
Stanislaus13514429%
Sutter4810--
Tehama6---
Trinity----
Tulare127311755%
Tuolumne142150%
Ventura851517%
Yolo16567710%
Yuba369333%
State Totals5353170721212%

* 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