Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2018
Year To Date (Weeks 1 - 21)

(2018-05-27) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda601318%
Alpine----
Amador8---
Butte131--
Calaveras3---
Colusa11--
Contra Costa1301--
Del Norte21--
El Dorado1511100%
Fresno60---
Glenn1---
Humboldt4---
Imperial1---
Inyo----
Kern24---
Kings61--
Lake6---
Lassen----
Los Angeles1167--
Madera3---
Marin13---
Mariposa----
Mendocino----
Merced91--
Modoc----
Mono----
Monterey16---
Napa7---
Nevada1---
Orange12099--
Placer281--
Plumas----
Riverside532--
Sacramento1866012%
San Benito11--
San Bernardino307--
San Diego6131--
San Francisco15---
San Joaquin4712--
San Luis Obispo5---
San Mateo10613215%
Santa Barbara72--
Santa Clara1382229%
Santa Cruz449--
Shasta3---
Sierra----
Siskiyou----
Solano14---
Sonoma322--
Stanislaus38---
Sutter121--
Tehama1---
Trinity1---
Tulare202--
Tuolumne----
Ventura272--
Yolo4210--
Yuba91--
State Totals153930472%

* 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