Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2018
Year To Date (Weeks 1 - 49)

(2018-12-12) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda337392051%
Alpine----
Amador161--
Butte10230413%
Calaveras8---
Colusa71--
Contra Costa705451329%
Del Norte31--
El Dorado942229%
Fresno1624--
Glenn6---
Humboldt245120%
Imperial1---
Inyo2---
Kern433133%
Kings142--
Lake206--
Lassen----
Los Angeles823921921%
Madera132--
Marin571--
Mariposa----
Mendocino10---
Merced551--
Modoc----
Mono----
Monterey334--
Napa194--
Nevada265--
Orange486359164%
Placer4612104421%
Plumas2---
Riverside16432619%
Sacramento151655424144%
San Benito91--
San Bernardino15320--
San Diego1788611%
San Francisco523--
San Joaquin207421638%
San Luis Obispo216--
San Mateo40512354%
Santa Barbara316--
Santa Clara6822225625%
Santa Cruz1324624%
Shasta379556%
Sierra1---
Siskiyou1---
Solano13214--
Sonoma11313--
Stanislaus1498113%
Sutter7624417%
Tehama184--
Trinity2---
Tulare6110--
Tuolumne1311100%
Ventura9615--
Yolo248924145%
Yuba4217--
State Totals8068218549923%

* 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