County | Reported* | Tested | Positive | % Tested Positive |
Alameda | 414 | 3 | - | - |
Alpine | 1 | - | - | - |
Amador | 40 | - | - | - |
Butte | 381 | 4 | - | - |
Calaveras | 44 | - | - | - |
Colusa | 30 | 1 | - | - |
Contra Costa | 1221 | 23 | - | - |
Del Norte | 11 | - | - | - |
El Dorado | 283 | 3 | - | - |
Fresno | 977 | 24 | 1 | 4% |
Glenn | 95 | 1 | - | - |
Humboldt | 32 | 3 | - | - |
Imperial | 30 | - | - | - |
Inyo | 22 | - | - | - |
Kern | 617 | 4 | - | - |
Kings | 152 | 8 | - | - |
Lake | 39 | 1 | - | - |
Lassen | 7 | - | - | - |
Los Angeles | 2014 | 37 | 1 | 3% |
Madera | 108 | 1 | - | - |
Marin | 147 | - | - | - |
Mariposa | 28 | 2 | - | - |
Mendocino | 49 | 1 | - | - |
Merced | 303 | - | - | - |
Modoc | 13 | 1 | - | - |
Mono | 7 | 1 | - | - |
Monterey | 147 | 2 | - | - |
Napa | 91 | - | - | - |
Nevada | 96 | 1 | - | - |
Orange | 862 | 83 | 2 | 2% |
Placer | 402 | 5 | - | - |
Plumas | 25 | - | - | - |
Riverside | 364 | - | - | - |
Sacramento | 1423 | 21 | - | - |
San Benito | 26 | 3 | - | - |
San Bernardino | 524 | 10 | - | - |
San Diego | 453 | 41 | 5 | 12% |
San Francisco | 83 | 2 | - | - |
San Joaquin | 581 | 4 | - | - |
San Luis Obispo | 143 | - | - | - |
San Mateo | 178 | 12 | - | - |
Santa Barbara | 63 | - | - | - |
Santa Clara | 628 | 17 | - | - |
Santa Cruz | 169 | 3 | - | - |
Shasta | 266 | 7 | - | - |
Sierra | - | - | - | - |
Siskiyou | 6 | - | - | - |
Solano | 262 | 1 | - | - |
Sonoma | 230 | - | - | - |
Stanislaus | 594 | 4 | - | - |
Sutter | 63 | 1 | - | - |
Tehama | 51 | - | - | - |
Trinity | 10 | - | - | - |
Tulare | 392 | 9 | - | - |
Tuolumne | 33 | 1 | - | - |
Ventura | 265 | 2 | - | - |
Yolo | 310 | 4 | - | - |
Yuba | 17 | 1 | - | - |
State Totals | 15822 | 352 | 9 | 3% |
* 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