Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2017
Year To Date (Weeks 1 - 29)

(2017-07-28) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda1543313%
Alpine1---
Amador10---
Butte3810--
Calaveras7---
Colusa62150%
Contra Costa27413--
Del Norte----
El Dorado496--
Fresno1095120%
Glenn3---
Humboldt7---
Imperial1---
Inyo2---
Kern5833100%
Kings202--
Lake231119%
Lassen----
Los Angeles437491327%
Madera161--
Marin377--
Mariposa2---
Mendocino8---
Merced263--
Modoc----
Mono----
Monterey121--
Napa223--
Nevada134125%
Orange37222384%
Placer1979611%
Plumas1---
Riverside149291138%
Sacramento6302392611%
San Benito71--
San Bernardino129211152%
San Diego13345716%
San Francisco265--
San Joaquin1583126%
San Luis Obispo112--
San Mateo2504912%
Santa Barbara195--
Santa Clara27234--
Santa Cruz447114%
Shasta22---
Sierra1---
Siskiyou1---
Solano549--
Sonoma7814--
Stanislaus1309--
Sutter2510--
Tehama6---
Trinity----
Tulare5715853%
Tuolumne11--
Ventura7811--
Yolo9131--
Yuba216--
State Totals42981046979%

* 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