Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2018
Year To Date (Weeks 1 - 45)

(2018-11-12) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda320362056%
Alpine----
Amador161--
Butte10030413%
Calaveras8---
Colusa71--
Contra Costa677441330%
Del Norte31--
El Dorado882229%
Fresno1594--
Glenn6---
Humboldt245120%
Imperial1---
Inyo2---
Kern433133%
Kings142--
Lake196--
Lassen----
Los Angeles798901921%
Madera132--
Marin511--
Mariposa----
Mendocino10---
Merced551--
Modoc----
Mono----
Monterey334--
Napa194--
Nevada265--
Orange435325155%
Placer4521984422%
Plumas2---
Riverside15130620%
Sacramento148355424144%
San Benito81--
San Bernardino15120--
San Diego1586811%
San Francisco483--
San Joaquin202421638%
San Luis Obispo196--
San Mateo39210455%
Santa Barbara263--
Santa Clara6552115526%
Santa Cruz1243925%
Shasta349556%
Sierra1---
Siskiyou1---
Solano12814--
Sonoma10613--
Stanislaus1488113%
Sutter7424417%
Tehama184--
Trinity2---
Tulare6010--
Tuolumne1311100%
Ventura9315--
Yolo236924145%
Yuba4217--
State Totals7754207349724%

* 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