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
2018 |
2017 |
2016 |
2015 |
2014
2013 |
2012 |
2011
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2009 |
2008
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Report a Dead Bird
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Locate your local mosquito and vector control agency
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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