County | Reported* | Tested | Positive | % Tested Positive |
Alameda | 290 | 77 | 2 | 3% |
Alpine | - | - | - | - |
Amador | 6 | - | - | - |
Butte | 32 | 11 | 2 | 18% |
Calaveras | 4 | - | - | - |
Colusa | 2 | - | - | - |
Contra Costa | 392 | 37 | 4 | 11% |
Del Norte | 1 | - | - | - |
El Dorado | 37 | 8 | - | - |
Fresno | 91 | 8 | - | - |
Glenn | 4 | - | - | - |
Humboldt | 1 | - | - | - |
Imperial | 1 | - | - | - |
Inyo | 1 | - | - | - |
Kern | 27 | 4 | - | - |
Kings | 9 | - | - | - |
Lake | 6 | 4 | - | - |
Lassen | - | - | - | - |
Los Angeles | 762 | 133 | 43 | 32% |
Madera | 6 | 2 | - | - |
Marin | 39 | 2 | - | - |
Mariposa | 1 | - | - | - |
Mendocino | 5 | - | - | - |
Merced | 35 | 2 | 1 | 50% |
Modoc | - | - | - | - |
Mono | - | - | - | - |
Monterey | 13 | 7 | - | - |
Napa | 26 | 8 | - | - |
Nevada | 20 | 7 | 2 | 29% |
Orange | 553 | 435 | 7 | 2% |
Placer | 120 | 52 | 5 | 10% |
Plumas | - | - | - | - |
Riverside | 108 | 26 | - | - |
Sacramento | 712 | 403 | 100 | 25% |
San Benito | 5 | 1 | - | - |
San Bernardino | 111 | 26 | 1 | 4% |
San Diego | 137 | 76 | 1 | 1% |
San Francisco | 37 | 8 | - | - |
San Joaquin | 133 | 54 | 17 | 31% |
San Luis Obispo | 26 | 8 | - | - |
San Mateo | 302 | 78 | - | - |
Santa Barbara | 36 | 10 | - | - |
Santa Clara | 453 | 93 | 1 | 1% |
Santa Cruz | 66 | 18 | - | - |
Shasta | 19 | 1 | - | - |
Sierra | - | - | - | - |
Siskiyou | 1 | - | - | - |
Solano | 65 | 24 | 2 | 8% |
Sonoma | 96 | 9 | 1 | 11% |
Stanislaus | 124 | 14 | 2 | 14% |
Sutter | 27 | 7 | 1 | 14% |
Tehama | 2 | - | - | - |
Trinity | 1 | - | - | - |
Tulare | 48 | 14 | 7 | 50% |
Tuolumne | 2 | 1 | - | - |
Ventura | 48 | 14 | 1 | 7% |
Yolo | 162 | 70 | 10 | 14% |
Yuba | 20 | 3 | - | - |
State Totals | 5225 | 1755 | 210 | 12% |
* 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