Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2017
Year To Date (Weeks 1 - 46)

(2017-11-19) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda2633626%
Alpine1---
Amador11---
Butte9724521%
Calaveras8---
Colusa82150%
Contra Costa674431944%
Del Norte----
El Dorado7118211%
Fresno16611545%
Glenn622100%
Humboldt112150%
Imperial3---
Inyo9---
Kern7433100%
Kings283133%
Lake3924521%
Lassen----
Los Angeles85415610064%
Madera273133%
Marin619111%
Mariposa4---
Mendocino10---
Merced637114%
Modoc----
Mono2---
Monterey334125%
Napa385--
Nevada248113%
Orange6104205513%
Placer24512243%
Plumas1---
Riverside285674161%
Sacramento9243588624%
San Benito91--
San Bernardino252594576%
San Diego2381014141%
San Francisco519111%
San Joaquin22840718%
San Luis Obispo5010660%
San Mateo3807911%
Santa Barbara356117%
Santa Clara485921213%
Santa Cruz751716%
Shasta463267%
Sierra1---
Siskiyou1---
Solano10021419%
Sonoma12226519%
Stanislaus21322627%
Sutter5822314%
Tehama9---
Trinity11--
Tulare7916850%
Tuolumne61--
Ventura11416213%
Yolo182611423%
Yuba4316638%
State Totals7428194650226%

* 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