Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | 1 | | Butte | 10 | | Calaveras | - | | Colusa | - | | Contra Costa | 3 | | Del Norte | - | | El Dorado | - | | Fresno | 5 | | Glenn | 2 | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | 8 | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 42 | | Madera | 3 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 2 | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | 1 | | Nevada | 1 | | Orange | 9 | | Placer | 9 | | Plumas | - | | Riverside | 14 | | Sacramento | 8 | | San Benito | - | | San Bernardino | 6 | | San Diego | 1 | | San Francisco | - | | San Joaquin | 13 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 15 | | Sutter | 1 | | Tehama | 1 | | Trinity | - | | Tulare | 7 | | Tuolumne | 1 | | Ventura | 2 | | Yolo | 10 | | Yuba | 2 |
| Total | 182 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | 1 | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 2 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 1 | | Plumas | - | | Riverside | - | | Sacramento | 3 | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | 1 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 1 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 11 |
| County | Dead birds | | Alameda | 20 | | Alpine | - | | Amador | - | | Butte | 4 | | Calaveras | - | | Colusa | - | | Contra Costa | 13 | | Del Norte | - | | El Dorado | 2 | | Fresno | - | | Glenn | - | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 19 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 15 | | Placer | 44 | | Plumas | - | | Riverside | 6 | | Sacramento | 241 | | San Benito | - | | San Bernardino | - | | San Diego | 1 | | San Francisco | - | | San Joaquin | 16 | | San Luis Obispo | - | | San Mateo | 5 | | Santa Barbara | - | | Santa Clara | 55 | | Santa Cruz | 2 | | Shasta | 5 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 1 | | Sutter | 4 | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | 1 | | Ventura | - | | Yolo | 41 | | Yuba | - |
| Total | 497 |
| County | Mosquito samples | | Alameda | 15 | | Alpine | - | | Amador | - | | Butte | 48 | | Calaveras | - | | Colusa | - | | Contra Costa | 17 | | Del Norte | - | | El Dorado | - | | Fresno | 119 | | Glenn | 4 | | Humboldt | - | | Imperial | 1 | | Inyo | - | | Kern | 48 | | Kings | 22 | | Lake | 4 | | Lassen | - | | Los Angeles | 72 | | Madera | 55 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 12 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 96 | | Placer | 230 | | Plumas | - | | Riverside | 36 | | Sacramento | 300 | | San Benito | - | | San Bernardino | 12 | | San Diego | 3 | | San Francisco | - | | San Joaquin | 533 | | San Luis Obispo | - | | San Mateo | 2 | | Santa Barbara | - | | Santa Clara | 5 | | Santa Cruz | - | | Shasta | 8 | | Sierra | - | | Siskiyou | - | | Solano | 3 | | Sonoma | 1 | | Stanislaus | 111 | | Sutter | 28 | | Tehama | - | | Trinity | - | | Tulare | 77 | | Tuolumne | - | | Ventura | - | | Yolo | 90 | | Yuba | 8 |
| Total | 1960 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 37 | | Calaveras | - | | Colusa | 6 | | Contra Costa | 16 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 28 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 16 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 4 | | Plumas | - | | Riverside | - | | Sacramento | 5 | | San Benito | 1 | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 8 | | Santa Cruz | - | | Shasta | 4 | | Sierra | - | | Siskiyou | - | | Solano | 7 | | Sonoma | - | | Stanislaus | - | | Sutter | 20 | | Tehama | 1 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 5 | | Yuba | 2 |
| Total | 161 |
WNV Activity by County
Printable Version
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2017 |
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Compared to previous year and previous five-year average to date
| As of Nov 16, 2018 | 2018 | 2017 | 5Y AVG |
| Counties | 41 | 44 | 42 |
| Human cases | 182 | 464 | 514 | | Dead birds | 497 | 503 | 1365 | | Mosquito samples | 1960 | 3360 | 3208 | | Sentinel chickens | 161 | 304 | 401 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2018 YTD activity -
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WNV Reports
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