Case Counts by County
County | Human cases | Alameda | - | Alpine | - | Amador | 1 | Butte | 12 | Calaveras | - | Colusa | - | Contra Costa | 4 | Del Norte | - | El Dorado | - | Fresno | 13 | Glenn | 2 | Humboldt | 1 | Imperial | - | Inyo | - | Kern | 13 | Kings | - | Lake | 1 | Lassen | - | Los Angeles | 43 | Madera | 4 | Marin | - | Mariposa | - | Mendocino | - | Merced | 2 | Modoc | - | Mono | - | Monterey | 1 | Napa | 1 | Nevada | 1 | Orange | 9 | Placer | 9 | Plumas | - | Riverside | 15 | Sacramento | 15 | San Benito | - | San Bernardino | 8 | San Diego | 2 | San Francisco | - | San Joaquin | 14 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | 1 | Santa Cruz | - | Shasta | 1 | Sierra | - | Siskiyou | - | Solano | - | Sonoma | - | Stanislaus | 15 | Sutter | 1 | Tehama | 2 | Trinity | - | Tulare | 8 | Tuolumne | 1 | Ventura | 2 | Yolo | 11 | Yuba | 2 |
Total | 215 |
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 | 18 | 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 | 56 | Santa Cruz | 2 | Shasta | 5 | Sierra | - | Siskiyou | - | Solano | - | Sonoma | - | Stanislaus | 1 | Sutter | 4 | Tehama | - | Trinity | - | Tulare | - | Tuolumne | 1 | Ventura | - | Yolo | 41 | Yuba | - |
Total | 501 |
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 | 75 | 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 | 1963 |
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 | 30 | 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 | 163 |
WNV Activity by County Printable Version
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Compared to previous year and previous five-year average to date
As of Jan 10, 2019 | 2018 | 2017 | 5Y AVG |
Counties | 41 | 44 | 33 |
Human cases | 215 | 553 | 516 | Dead birds | 501 | 510 | 1131 | Mosquito samples | 1963 | 3371 | 2714 | Sentinel chickens | 163 | 305 | 308 |
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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