Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 1 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 3 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 5 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 0 |
| County | Dead birds | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 2 | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 10 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 3 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 9 | | Madera | 7 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 6 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 3 | | Placer | 1 | | Plumas | - | | Riverside | - | | Sacramento | 44 | | San Benito | - | | San Bernardino | 1 | | San Diego | 1 | | San Francisco | - | | San Joaquin | 14 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 22 | | Santa Cruz | 4 | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 10 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | 2 | | Tuolumne | - | | Ventura | - | | Yolo | 3 | | Yuba | - |
| Total | 143 |
| County | Mosquito samples | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 34 | | Glenn | - | | Humboldt | - | | Imperial | 9 | | Inyo | - | | Kern | 66 | | Kings | 4 | | Lake | - | | Lassen | - | | Los Angeles | 4 | | Madera | 6 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 4 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 7 | | Placer | 2 | | Plumas | - | | Riverside | 39 | | Sacramento | 94 | | San Benito | - | | San Bernardino | 2 | | San Diego | - | | San Francisco | - | | San Joaquin | 6 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 10 | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 7 | | Sutter | 5 | | Tehama | - | | Trinity | - | | Tulare | 22 | | Tuolumne | - | | Ventura | - | | Yolo | 1 | | Yuba | - |
| Total | 322 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | 8 | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | 15 | | Sacramento | - | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 24 |
| County | Squirrels | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 1 | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 1 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | 1 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 3 |
WNV Activity by County Printable Version
2009 |
2008 |
2007
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 Human data is updated every Tuesday by 4pm. Dead bird and squirrel data are updated every Wednesday by 4pm. Horse, mosquito and sentinel chicken data are updated either on Mondays or Fridays by 4pm.
- View Printable Map -
Total Counties with WNV in 2010: 22New counties highlighted in red. Butte, Fresno, Imperial, Kern, Kings, Los Angeles, Madera, Merced, Orange, Placer, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, Santa Clara, Santa Cruz, Shasta, Stanislaus, Sutter, Tulare, and Yolo.
WNV News
National Activity
As of July 20, 2010, 26 human cases had been reported in 9 states: Alabama (1), Arizona (13), California (2), Colorado (3), Georgia (3), Kansas (1), Mississippi (1), North Dakota (1), and South Dakota (1). Ten (38%) cases had neuroinvasive illness. One fatality has been reported in Arizona.
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human cases YTD: 5 Counties: 3There was 1 new WNV positive human case reported in California this week from Fresno County. This is the first WNV positive human case from Fresno County this year. 5 human cases from 3 counties have tested positive for WNV in 2010.
horses YTD: 0 Counties: 0 No horses have tested positive for WNV in 2010.
dead birds YTD: 143 Counties: 18There were 47 new WNV positive dead birds reported in California this week from the following counties: Fresno (4), Kern (1), Los Angeles (1), Madera (1), Merced (1), Orange (1), Sacramento (17), San Joaquin (11), Santa Clara (1), Shasta (1), Stanislaus (6), Tulare (1), and Yolo (1). This is the first indication of WNV from Shasta County this year. [ More info] 143 dead birds from 18 counties have tested positive for WNV in 2010.
mosquito samples YTD: 322 Counties: 18There were 120 new WNV positive mosquito samples reported in California last week from the following counties: Fresno (10), Imperial (2), Kern (25), Kings (4), Los Angeles (3), Madera (1), Orange (4), Placer (2), Riverside (7), Sacramento (38), Stanislaus (5), Sutter (1), Tulare (17), and Yolo (1). These are the first WNV positive mosquito samples from Placer and Yolo counties this year. This is the first indication of WNV from Kings County this year. 322 mosquito samples from 18 counties have tested positive for WNV in 2010.
sentinel chickens YTD: 24 Counties: 3There were 16 new WNV positive sentinel chickens reported in California last week from the following counties: Imperial (5), Kern (1), and Riverside (10). This is the first WNV positive sentinel chicken from Kern County this year. 24 sentinel chickens from 3 counties have tested positive for WNV in 2010.
squirrels YTD: 3 Counties: 3There have been 2 new WNV positive squirrels reported in California last week from Fresno (1) and San Bernardino (1) counties. These are the first WNV positive squirrels from Fresno and San Bernardino counties this year. 3 squirrels from 3 counties have tested positive for WNV in 2010.
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Help us track down the West Nile Virus by reporting all dead birds and squirrels. Call 1-877-968-2473 to report a dead bird or squirrel or you can submit an online report.
| Element |
2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
2009 |
Total |
| Human cases (fatal) |
31 (0) |
779 (29) |
880 (19) |
278 (7) |
380 (21) |
445 (15) |
112 (4) |
2,877 (95) |
| Horses |
12 |
540 |
456 |
58 |
28 |
32 |
18 |
1,133 |
| Dead birds |
96 |
3,232 |
3,046 |
1,446 |
1,396 |
2,569 |
515 |
12,300 |
| Mosquito samples |
32 |
1,136 |
1,242 |
832 |
1,007 |
2,003 |
1,063 |
7,315 |
| Sentinel chickens |
70 |
809 |
1,053 |
640 |
210 |
585 |
443 |
4,110 |
| Squirrels |
- |
49 |
48 |
32 |
26 |
32 |
10 |
197 |
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1 There were 20 imported human cases.
2 There were 3 imported horse cases.
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Locate Your Local Mosquito and Vector Control Agency
Compared to 2009 YTD
| As of Jul 28, 2010 | 2009 | 2010 |
| Counties | 32 | 22 |
| Human cases | 2 | 5 | | Horses | 0 | 0 | | Dead birds | 241 | 143 | | Mosquito samples | 233 | 322 | | Sentinel chickens | 13 | 24 | | Squirrels | 1 | 3 |
2009 YTD - Year to date corresponds to the same time last year.
- view all 2009 YTD activity -
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WNV Reports
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