Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2017
Year To Date (Weeks 1 - 24)

(2017-06-23) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda12221--
Alpine1---
Amador8---
Butte246--
Calaveras3---
Colusa3---
Contra Costa2069--
Del Norte----
El Dorado343--
Fresno702--
Glenn----
Humboldt5---
Imperial1---
Inyo2---
Kern5011100%
Kings181--
Lake164--
Lassen----
Los Angeles28829310%
Madera91--
Marin315--
Mariposa2---
Mendocino6---
Merced23---
Modoc----
Mono----
Monterey101--
Napa142--
Nevada112150%
Orange26714121%
Placer14376--
Plumas1---
Riverside851417%
Sacramento487159106%
San Benito41--
San Bernardino611119%
San Diego1093526%
San Francisco193--
San Joaquin1112414%
San Luis Obispo92--
San Mateo1913613%
Santa Barbara144--
Santa Clara21827--
Santa Cruz283--
Shasta19---
Sierra1---
Siskiyou1---
Solano457--
Sonoma5710--
Stanislaus898--
Sutter195--
Tehama6---
Trinity----
Tulare398450%
Tuolumne11--
Ventura759--
Yolo6420--
Yuba163--
State Totals3136694274%

* 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