Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 2 | | Calaveras | - | | Colusa | - | | Contra Costa | 5 | | Del Norte | - | | El Dorado | 1 | | Fresno | 13 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 19 | | Kings | 3 | | Lake | - | | Lassen | - | | Los Angeles | 20 | | Madera | 1 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | - | | Orange | 3 | | Placer | - | | Plumas | - | | Riverside | 3 | | Sacramento | - | | San Benito | - | | San Bernardino | 1 | | San Diego | 3 | | San Francisco | - | | San Joaquin | 9 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 13 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | 4 | | Tuolumne | - | | Ventura | - | | Yolo | 2 | | Yuba | 1 |
| Total | 105 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | 1 | | Del Norte | - | | El Dorado | - | | Fresno | 1 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 1 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 3 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | 1 | | Sacramento | 2 | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | 3 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 2 | | Sutter | - | | Tehama | 1 | | Trinity | - | | Tulare | 1 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 18 |
| County | Dead birds | | Alameda | 10 | | Alpine | - | | Amador | 1 | | Butte | 13 | | Calaveras | - | | Colusa | 2 | | Contra Costa | 45 | | Del Norte | - | | El Dorado | 9 | | Fresno | 62 | | Glenn | 6 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 28 | | Kings | 9 | | Lake | 2 | | Lassen | - | | Los Angeles | 82 | | Madera | 11 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 9 | | Modoc | 1 | | Mono | - | | Monterey | 4 | | Napa | - | | Nevada | - | | Orange | 10 | | Placer | 4 | | Plumas | - | | Riverside | 2 | | Sacramento | 28 | | San Benito | - | | San Bernardino | 18 | | San Diego | 39 | | San Francisco | 1 | | San Joaquin | 24 | | San Luis Obispo | 1 | | San Mateo | 1 | | Santa Barbara | 1 | | Santa Clara | 14 | | Santa Cruz | 1 | | Shasta | 9 | | Sierra | - | | Siskiyou | - | | Solano | 3 | | Sonoma | - | | Stanislaus | 28 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | 25 | | Tuolumne | 2 | | Ventura | 3 | | Yolo | 7 | | Yuba | - |
| Total | 515 |
| County | Mosquito samples | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | 5 | | Calaveras | - | | Colusa | - | | Contra Costa | 17 | | Del Norte | - | | El Dorado | - | | Fresno | 132 | | Glenn | - | | Humboldt | - | | Imperial | 3 | | Inyo | - | | Kern | 138 | | Kings | 105 | | Lake | 2 | | Lassen | - | | Los Angeles | 99 | | Madera | 3 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 11 | | Modoc | - | | Mono | 1 | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 16 | | Placer | 40 | | Plumas | - | | Riverside | 27 | | Sacramento | 36 | | San Benito | - | | San Bernardino | 54 | | San Diego | 5 | | San Francisco | - | | San Joaquin | 83 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 14 | | Santa Cruz | - | | Shasta | 2 | | Sierra | - | | Siskiyou | - | | Solano | 2 | | Sonoma | - | | Stanislaus | 94 | | Sutter | 25 | | Tehama | - | | Trinity | - | | Tulare | 131 | | Tuolumne | - | | Ventura | - | | Yolo | 16 | | Yuba | 1 |
| Total | 1063 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 36 | | Calaveras | - | | Colusa | - | | Contra Costa | 13 | | Del Norte | - | | El Dorado | - | | Fresno | 17 | | Glenn | 3 | | Humboldt | - | | Imperial | 42 | | Inyo | - | | Kern | 104 | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 41 | | Madera | 7 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 14 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 3 | | Nevada | - | | Orange | - | | Placer | 11 | | Plumas | - | | Riverside | 37 | | Sacramento | 2 | | San Benito | - | | San Bernardino | 14 | | San Diego | 5 | | San Francisco | - | | San Joaquin | 10 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 13 | | Sonoma | - | | Stanislaus | 25 | | Sutter | 11 | | Tehama | 2 | | Trinity | - | | Tulare | 28 | | Tuolumne | - | | Ventura | - | | Yolo | 4 | | Yuba | - |
| Total | 443 |
| County | Squirrels | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | 2 | | 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 | 1 | | San Benito | - | | San Bernardino | 2 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 2 | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | 1 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 10 |
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 2009:
42
National Activity
As of December 8, 2009, 663 human cases had been reported nationwide in the following 34 states: Arizona (18), Arkansas (4), California (103), Colorado (101), Florida (3), Georgia (4), Idaho (37), Illinois (4), Indiana (4), Iowa (5), Kansas (10), Kentucky (3), Louisiana (20), Maryland (2), Minnesota (4), Mississippi (52), Missouri (3), Montana (5), Nebraska (51), Nevada (12), New Jersey (2), New Mexico (8), New York (6), North Dakota (1), Ohio (2), Oklahoma (8), Oregon (7), South Carolina (3), South Dakota (21), Tennessee (7), Texas (104), Washington (36), Wisconsin (1), and Wyoming (12). Of the 663 individuals, 335 (51%) have neuroinvasive illness. A total of 30 fatalities had been reported as of December 8 in Arkansas (1), California (4), Colorado (3), Georgia (1), Idaho (2), Indiana (1), Maryland (1), Mississippi (4), New Mexico (1), Oklahoma (1), Tennessee (1), Texas (8), Washington (1), and Wyoming (1).
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human cases YTD: 110 Counties: 19 Four fatalities have been reported in Fresno (1), Los Angeles (1), Merced (1) and Stanislaus (1) counties. 110 human cases from 19 counties have tested positive for WNV in 2009.
horses YTD: 18 Counties: 12 18 horses from 12 counties have tested positive for WNV in 2009.
dead birds YTD: 515 Counties: 36 515 dead birds from 36 counties have tested positive for WNV in 2009.
mosquito samples YTD: 1,063 Counties: 27 1,063 mosquito samples from 27 counties have tested positive for WNV in 2009.
sentinel chickens YTD: 443 Counties: 23 443 sentinel chickens from 23 counties have tested positive for WNV in 2009.
squirrels YTD: 10 Counties: 7 10 squirrels from 7 counties have tested positive for WNV in 2009.
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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) |
110 (4) |
2,875 (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 2008 YTD
| As of Jan 21, 2010 | 2008 | 2009 |
| Counties | 49 | 42 |
| Human cases | 416 | 110 | | Horses | 32 | 18 | | Dead birds | 2568 | 515 | | Mosquito samples | 2003 | 1063 | | Sentinel chickens | 584 | 443 | | Squirrels | 32 | 10 |
2008 YTD - Year to date corresponds to the same time last year.
- view all 2008 YTD activity -
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WNV Reports
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