Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | 1 | | Butte | 3 | | Calaveras | - | | Colusa | - | | Contra Costa | 3 | | Del Norte | - | | El Dorado | 1 | | Fresno | 9 | | Glenn | 1 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 18 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 58 | | Madera | 2 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 10 | | Placer | 1 | | Plumas | - | | Riverside | 7 | | Sacramento | 4 | | San Benito | - | | San Bernardino | 4 | | San Diego | - | | San Francisco | - | | San Joaquin | 5 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | 1 | | Santa Clara | 1 | | Santa Cruz | 1 | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 11 | | Sutter | - | | Tehama | 1 | | Trinity | - | | Tulare | 11 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | 1 |
| Total | 155 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 5 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 1 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 3 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 2 | | 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 | 1 | | Tuolumne | - | | Ventura | - | | Yolo | 2 | | Yuba | - |
| Total | 15 |
| County | Dead birds | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | 38 | | Del Norte | - | | El Dorado | 2 | | Fresno | 15 | | Glenn | 2 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 4 | | Kings | 9 | | Lake | 1 | | Lassen | - | | Los Angeles | 227 | | Madera | 3 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 9 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | 1 | | Orange | 49 | | Placer | 10 | | Plumas | - | | Riverside | 7 | | Sacramento | 134 | | San Benito | - | | San Bernardino | 33 | | San Diego | - | | San Francisco | - | | San Joaquin | 27 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 36 | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 24 | | Sutter | 2 | | Tehama | 1 | | Trinity | - | | Tulare | 42 | | Tuolumne | - | | Ventura | 1 | | Yolo | 9 | | Yuba | 1 |
| Total | 688 |
| County | Mosquito samples | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 1 | | Calaveras | - | | Colusa | - | | Contra Costa | 7 | | Del Norte | - | | El Dorado | - | | Fresno | 123 | | Glenn | - | | Humboldt | - | | Imperial | 3 | | Inyo | 2 | | Kern | 389 | | Kings | 63 | | Lake | 3 | | Lassen | - | | Los Angeles | 467 | | Madera | 5 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 11 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 91 | | Placer | 48 | | Plumas | - | | Riverside | 56 | | Sacramento | 381 | | San Benito | - | | San Bernardino | 150 | | San Diego | 1 | | San Francisco | - | | San Joaquin | 51 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 16 | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | 2 | | Stanislaus | 100 | | Sutter | 26 | | Tehama | - | | Trinity | - | | Tulare | 82 | | Tuolumne | - | | Ventura | - | | Yolo | 7 | | Yuba | 1 |
| Total | 2087 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 20 | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | 5 | | Humboldt | - | | Imperial | 3 | | Inyo | - | | Kern | 140 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 86 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 15 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 6 | | Plumas | - | | Riverside | 40 | | Sacramento | 7 | | San Benito | - | | San Bernardino | 42 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 7 | | Sutter | 8 | | Tehama | - | | Trinity | - | | Tulare | 7 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | 4 |
| Total | 391 |
| County | Squirrels | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 15 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 1 | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | 3 | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 3 | | Yuba | - |
| Total | 24 |
WNV Activity by County Printable Version
2010 |
2009 |
2008 |
2007
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Human data is updated every Tuesday and Friday by 4pm. Dead bird and squirrel data are updated every Wednesday by 4pm. Horse, mosquito and sentinel chicken data are updated on Fridays by 4pm.
- View Printable Map -
Total Counties with WNV in 2011:
36
Alameda, Amador, Butte, Contra Costa, El Dorado, Fresno, Glenn, Imperial, Inyo, Kern, Kings, Lake, Los Angeles, Madera, Merced, Nevada, Orange, Placer, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Solano, Sonoma, Stanislaus, Sutter, Tehama, Tulare, Ventura, Yolo, and Yuba.
National Activity
As of December 13, 2011, 667 human cases of WNV had been reported nationwide in 42 states and the District of Columbia: Alabama (5), Arizona (58), Arkansas (1), California (154), Colorado (7), Connecticut (9), Delaware (1), District of Columbia (4), Florida (23), Georgia (12), Idaho (2), Illinois (34), Indiana (9), Iowa (9), Kansas (4), Kentucky (5), Louisiana (10), Maryland (20), Massachusetts (5), Michigan (33), Minnesota (2), Mississippi (52), Missouri (10), Montana (1), Nebraska (28), Nevada (16), New Jersey (7), New Mexico (4), New York (43), North Carolina (2), North Dakota (4), Ohio (21), Pennsylvania (6), Rhode Island (1), South Dakota (2), Tennessee (18), Texas (26), Utah (3), Vermont (1), Virginia (8), West Virginia (1), Wisconsin (3), and Wyoming (3). Of the 667 cases, 458 (69%) developed neuroinvasive disease. As of December 13, 2011, a total of 42 WNV-related fatalities had been reported in Alabama (1), Arizona (4), California (8), Florida (2), Georgia (3), Illinois (3), Indiana (1), Kansas (1), Kentucky (1), Michigan (2), Minnesota (1), Mississippi (5), Nevada (2), New York (2), Ohio (1), Tennessee (2), Texas (2), and Virginia (1).
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human cases YTD: 155 Counties: 23 There have been 8 fatalities from Kern (3), Los Angeles (4), and Tehama (1) counties in 2011. 155 human cases from 23 counties have tested positive for WNV in 2011.
horses YTD: 15 Counties: 7 15 horses from 7 counties have tested positive for WNV in 2011.
dead birds YTD: 688 Counties: 26There were 2 new WNV positive dead birds reported in California this week from Orange County. [ More info] 688 dead birds from 26 counties have tested positive for WNV in 2011.
mosquito samples YTD: 2,087 Counties: 26 2,087 mosquito samples from 26 counties have tested positive for WNV in 2011.
sentinel chickens YTD: 391 Counties: 15 391 sentinel chickens from 15 counties have tested positive for WNV in 2011.
squirrels YTD: 24 Counties: 6 24 squirrels from 6 counties have tested positive for WNV in 2011.
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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 |
2010 |
Total |
| Human cases (fatal) |
31 (0) |
779 (29) |
880 (19) |
278 (7) |
380 (21) |
445 (15) |
112 (4) |
111 (6) |
2,988 (101) |
| Horses |
12 |
540 |
456 |
58 |
28 |
32 |
18 |
19 |
1,152 |
| Dead birds |
96 |
3,232 |
3,046 |
1,446 |
1,396 |
2,569 |
515 |
416 |
12,716 |
| Mosquito samples |
32 |
1,136 |
1,242 |
832 |
1,007 |
2,003 |
1063 |
1,305 |
8,620 |
| Sentinel chickens |
70 |
809 |
1,053 |
640 |
510 |
585 |
443 |
281 |
4,391 |
| Squirrels |
- |
49 |
48 |
32 |
26 |
32 |
10 |
24 |
221 |
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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 2010 YTD
| As of Jan 24, 2012 | 2010 | 2011 |
| Counties | 35 | 36 |
| Human cases | 106 | 155 | | Horses | 19 | 15 | | Dead birds | 416 | 688 | | Mosquito samples | 1305 | 2087 | | Sentinel chickens | 281 | 391 | | Squirrels | 24 | 24 |
2010 YTD - Year to date corresponds to the same time last year.
- view all 2010 YTD activity -
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WNV Reports
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