Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 20 | | Calaveras | - | | Colusa | 2 | | Contra Costa | 1 | | Del Norte | - | | El Dorado | 1 | | Fresno | 8 | | Glenn | 3 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 8 | | Kings | 2 | | Lake | - | | Lassen | - | | Los Angeles | 76 | | Madera | 2 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | - | | Orange | 12 | | Placer | 3 | | Plumas | - | | Riverside | 2 | | Sacramento | 18 | | San Benito | - | | San Bernardino | 3 | | San Diego | 9 | | San Francisco | - | | San Joaquin | 5 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 16 | | Sutter | 9 | | Tehama | 5 | | Trinity | - | | Tulare | 3 | | Tuolumne | - | | Ventura | 2 | | Yolo | 12 | | Yuba | 9 |
| Total | 234 |
| County | Dead birds | | Alameda | 11 | | Alpine | - | | Amador | - | | Butte | 21 | | Calaveras | - | | Colusa | - | | Contra Costa | 26 | | Del Norte | - | | El Dorado | 4 | | Fresno | 6 | | Glenn | 4 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | 4 | | Lake | 4 | | Lassen | - | | Los Angeles | 113 | | Madera | 5 | | Marin | 5 | | Mariposa | - | | Mendocino | - | | Merced | 5 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 1 | | Nevada | 2 | | Orange | 78 | | Placer | 28 | | Plumas | - | | Riverside | 14 | | Sacramento | 408 | | San Benito | - | | San Bernardino | 5 | | San Diego | 254 | | San Francisco | - | | San Joaquin | 35 | | San Luis Obispo | - | | San Mateo | 11 | | Santa Barbara | - | | Santa Clara | 85 | | Santa Cruz | 2 | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 11 | | Sonoma | 8 | | Stanislaus | 12 | | Sutter | 10 | | Tehama | - | | Trinity | - | | Tulare | 3 | | Tuolumne | - | | Ventura | 30 | | Yolo | 71 | | Yuba | 4 |
| Total | 1283 |
| County | Mosquito samples | | Alameda | 2 | | Alpine | - | | Amador | - | | Butte | 48 | | Calaveras | - | | Colusa | - | | Contra Costa | 9 | | Del Norte | - | | El Dorado | - | | Fresno | 178 | | Glenn | 11 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 78 | | Kings | 114 | | Lake | 39 | | Lassen | - | | Los Angeles | 368 | | Madera | 98 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 12 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 4 | | Nevada | - | | Orange | 327 | | Placer | 102 | | Plumas | - | | Riverside | 31 | | Sacramento | 451 | | San Benito | - | | San Bernardino | 78 | | San Diego | 65 | | San Francisco | - | | San Joaquin | 334 | | San Luis Obispo | - | | San Mateo | 5 | | Santa Barbara | - | | Santa Clara | 13 | | Santa Cruz | 3 | | Shasta | 12 | | Sierra | - | | Siskiyou | - | | Solano | 16 | | Sonoma | 2 | | Stanislaus | 251 | | Sutter | 68 | | Tehama | - | | Trinity | - | | Tulare | 256 | | Tuolumne | - | | Ventura | - | | Yolo | 256 | | Yuba | 18 |
| Total | 3249 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 38 | | Calaveras | - | | Colusa | 9 | | Contra Costa | 5 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | 10 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 4 | | Lassen | - | | Los Angeles | 97 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 33 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | 1 | | Orange | - | | Placer | 6 | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | 18 | | San Diego | 9 | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 7 | | Sonoma | - | | Stanislaus | - | | Sutter | 32 | | Tehama | 8 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 3 | | Yuba | 13 |
| Total | 296 |
WNV Activity by County
Printable Version
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Compared to previous year and previous five-year average to date
| As of Sep 28, 2016 | 2016 | 2015 | 5Y AVG |
| Counties | 37 | 40 | 38 |
| Human cases | 234 | 233 | 192 | | Dead birds | 1283 | 1016 | 1237 | | Mosquito samples | 3249 | 2769 | 2451 | | Sentinel chickens | 296 | 314 | 325 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2015 YTD activity -
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WNV Reports
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