Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2019
Year To Date (Weeks 1 - 20)

(2019-05-22) - Source: http://www.westnile.ca.gov

CountyReported*TestedPositive% Tested Positive
Alameda729--
Alpine----
Amador2---
Butte191--
Calaveras3---
Colusa3---
Contra Costa1125--
Del Norte----
El Dorado111--
Fresno33---
Glenn----
Humboldt----
Imperial1---
Inyo13---
Kern5---
Kings5---
Lake3---
Lassen1---
Los Angeles15210--
Madera2---
Marin131--
Mariposa----
Mendocino2---
Merced42--
Modoc----
Mono----
Monterey9---
Napa171--
Nevada1---
Orange11485--
Placer6130--
Plumas----
Riverside3410--
Sacramento18340--
San Benito----
San Bernardino233--
San Diego684512%
San Francisco171--
San Joaquin354--
San Luis Obispo7---
San Mateo689--
Santa Barbara61--
Santa Clara16158--
Santa Cruz258--
Shasta6---
Sierra----
Siskiyou----
Solano174--
Sonoma232--
Stanislaus202--
Sutter11---
Tehama2---
Trinity----
Tulare101--
Tuolumne1---
Ventura241--
Yolo458--
Yuba4---
State Totals144834210%

* 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