Case Counts by County
County | Human cases | Alameda | - | Alpine | - | Amador | 1 | Butte | 5 | Calaveras | - | Colusa | 1 | Contra Costa | - | Del Norte | - | El Dorado | - | Fresno | 50 | Glenn | - | Humboldt | - | Imperial | 3 | Inyo | - | Kern | 27 | Kings | 2 | Lake | - | Lassen | - | Los Angeles | 30 | Madera | 3 | Marin | - | Mariposa | - | Mendocino | - | Merced | 10 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 5 | Placer | 1 | Plumas | - | Riverside | 10 | Sacramento | 2 | San Benito | - | San Bernardino | 7 | San Diego | 2 | San Francisco | - | San Joaquin | 7 | San Luis Obispo | 2 | San Mateo | - | Santa Barbara | - | Santa Clara | 1 | Santa Cruz | - | Shasta | - | Sierra | - | Siskiyou | - | Solano | 1 | Sonoma | - | Stanislaus | 16 | Sutter | - | Tehama | - | Trinity | - | Tulare | 17 | Tuolumne | - | Ventura | 2 | Yolo | - | Yuba | - |
Total | 205 |
County | Horses | Alameda | - | Alpine | - | Amador | - | Butte | - | Calaveras | - | Colusa | - | Contra Costa | - | Del Norte | - | El Dorado | - | Fresno | 2 | Glenn | - | Humboldt | - | Imperial | - | Inyo | - | Kern | 2 | Kings | - | Lake | - | Lassen | - | Los Angeles | - | Madera | 1 | Marin | - | Mariposa | - | Mendocino | - | Merced | 1 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | - | Placer | - | Plumas | - | Riverside | 1 | Sacramento | 1 | San Benito | - | San Bernardino | 1 | San Diego | - | San Francisco | - | San Joaquin | 1 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | - | Santa Cruz | - | Shasta | - | Sierra | - | Siskiyou | - | Solano | - | Sonoma | - | Stanislaus | 2 | Sutter | - | Tehama | - | Trinity | - | Tulare | 1 | Tuolumne | 1 | Ventura | 1 | Yolo | - | Yuba | - |
Total | 15 |
County | Dead birds | Alameda | - | Alpine | - | Amador | - | Butte | 1 | Calaveras | - | Colusa | - | Contra Costa | 1 | Del Norte | - | El Dorado | - | Fresno | 10 | Glenn | - | Humboldt | - | Imperial | - | Inyo | - | Kern | 2 | Kings | - | Lake | - | Lassen | - | Los Angeles | 52 | Madera | - | Marin | - | Mariposa | - | Mendocino | - | Merced | 3 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 50 | Placer | 3 | Plumas | - | Riverside | 5 | Sacramento | 44 | San Benito | - | San Bernardino | 4 | San Diego | 2 | San Francisco | - | San Joaquin | 5 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | 8 | Santa Cruz | - | Shasta | 1 | Sierra | - | Siskiyou | - | Solano | - | Sonoma | - | Stanislaus | 4 | Sutter | - | Tehama | - | Trinity | - | Tulare | 17 | Tuolumne | 1 | Ventura | 2 | Yolo | 7 | Yuba | 3 |
Total | 225 |
County | Mosquito samples | Alameda | - | Alpine | - | Amador | - | Butte | 44 | Calaveras | - | Colusa | - | Contra Costa | 1 | Del Norte | - | El Dorado | - | Fresno | 495 | Glenn | 1 | Humboldt | - | Imperial | 2 | Inyo | - | Kern | 128 | Kings | 63 | Lake | 6 | Lassen | - | Los Angeles | 94 | Madera | 85 | Marin | - | Mariposa | - | Mendocino | - | Merced | 48 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 208 | Placer | 53 | Plumas | - | Riverside | 524 | Sacramento | 74 | San Benito | - | San Bernardino | 52 | San Diego | - | San Francisco | - | San Joaquin | 288 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | - | Santa Cruz | - | Shasta | 3 | Sierra | - | Siskiyou | - | Solano | 5 | Sonoma | - | Stanislaus | 203 | Sutter | 15 | Tehama | - | Trinity | - | Tulare | 814 | Tuolumne | - | Ventura | 1 | Yolo | 59 | Yuba | 22 |
Total | 3288 |
County | Sentinel chickens | Alameda | - | Alpine | - | Amador | - | Butte | 34 | Calaveras | - | Colusa | 6 | Contra Costa | 2 | Del Norte | - | El Dorado | - | Fresno | - | Glenn | 1 | Humboldt | - | Imperial | - | Inyo | - | Kern | - | Kings | - | Lake | - | Lassen | - | Los Angeles | 28 | Madera | - | Marin | - | Mariposa | - | Mendocino | - | Merced | 16 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | - | Placer | 8 | Plumas | - | Riverside | - | Sacramento | 4 | San Benito | 1 | San Bernardino | - | San Diego | - | San Francisco | - | San Joaquin | - | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | - | Santa Cruz | - | Shasta | 1 | Sierra | - | Siskiyou | - | Solano | 4 | Sonoma | - | Stanislaus | - | Sutter | 11 | Tehama | 4 | Trinity | - | Tulare | 10 | Tuolumne | - | Ventura | 3 | Yolo | 1 | Yuba | 5 |
Total | 139 |
WNV Activity by County Printable Version
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Compared to previous year and previous five-year average to date
As of Dec 06, 2019 | 2019 | 2018 | 5Y AVG |
Counties | 33 | 41 | 42 |
Human cases | 205 | 201 | 515 | Dead birds | 225 | 500 | 1227 | Mosquito samples | 3288 | 1963 | 3104 | Sentinel chickens | 139 | 163 | 341 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2019 YTD activity -
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WNV Reports
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