Case Counts by County
County | Human cases | Alameda | 1 | Alpine | - | Amador | - | Butte | 6 | Calaveras | 1 | Colusa | 1 | Contra Costa | 4 | Del Norte | - | El Dorado | 1 | Fresno | 3 | Glenn | 1 | Humboldt | - | Imperial | - | Inyo | - | Kern | 2 | Kings | 2 | Lake | - | Lassen | - | Los Angeles | 153 | Madera | - | Marin | - | Mariposa | - | Mendocino | - | Merced | 1 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 71 | Placer | 6 | Plumas | - | Riverside | 62 | Sacramento | 13 | San Benito | - | San Bernardino | 30 | San Diego | 34 | San Francisco | - | San Joaquin | 12 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | 1 | Santa Cruz | - | Shasta | 1 | Sierra | - | Siskiyou | - | Solano | 1 | Sonoma | - | Stanislaus | 17 | Sutter | - | Tehama | 4 | Trinity | - | Tulare | 4 | Tuolumne | - | Ventura | - | Yolo | 1 | Yuba | - |
Total | 433 |
County | Horses | Alameda | - | Alpine | - | Amador | - | Butte | - | Calaveras | - | Colusa | - | Contra Costa | 3 | Del Norte | - | El Dorado | - | Fresno | 1 | Glenn | - | Humboldt | - | Imperial | - | Inyo | - | Kern | - | Kings | - | Lake | 1 | Lassen | - | Los Angeles | - | Madera | - | Marin | - | Mariposa | - | Mendocino | - | Merced | 1 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 2 | Placer | 1 | Plumas | - | Riverside | 9 | Sacramento | 3 | San Benito | - | San Bernardino | 2 | San Diego | 4 | San Francisco | - | San Joaquin | - | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | - | Santa Cruz | - | Shasta | - | Sierra | - | Siskiyou | - | Solano | - | Sonoma | - | Stanislaus | 2 | Sutter | - | Tehama | - | Trinity | - | Tulare | 1 | Tuolumne | - | Ventura | 1 | Yolo | 1 | Yuba | - |
Total | 32 |
County | Dead birds | Alameda | 12 | Alpine | - | Amador | 3 | Butte | 38 | Calaveras | 1 | Colusa | 3 | Contra Costa | 88 | Del Norte | 1 | El Dorado | 9 | Fresno | 41 | Glenn | 17 | Humboldt | 1 | Imperial | - | Inyo | - | Kern | 10 | Kings | 1 | Lake | 2 | Lassen | - | Los Angeles | 480 | Madera | 3 | Marin | 1 | Mariposa | - | Mendocino | 1 | Merced | 5 | Modoc | 1 | Mono | 2 | Monterey | 6 | Napa | 1 | Nevada | 5 | Orange | 636 | Placer | 4 | Plumas | - | Riverside | 39 | Sacramento | 130 | San Benito | - | San Bernardino | 174 | San Diego | 562 | San Francisco | - | San Joaquin | 69 | San Luis Obispo | 2 | San Mateo | 2 | Santa Barbara | 1 | Santa Clara | 13 | Santa Cruz | 3 | Shasta | 7 | Sierra | - | Siskiyou | - | Solano | 7 | Sonoma | 11 | Stanislaus | 45 | Sutter | 2 | Tehama | 6 | Trinity | 1 | Tulare | 51 | Tuolumne | - | Ventura | 24 | Yolo | 9 | Yuba | - |
Total | 2530 |
County | Mosquito samples | Alameda | 1 | Alpine | - | Amador | - | Butte | 5 | Calaveras | - | Colusa | - | Contra Costa | 31 | Del Norte | - | El Dorado | - | Fresno | 52 | Glenn | 1 | Humboldt | - | Imperial | 7 | Inyo | - | Kern | 7 | Kings | - | Lake | 3 | Lassen | 1 | Los Angeles | 517 | Madera | 1 | Marin | - | Mariposa | - | Mendocino | - | Merced | - | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 361 | Placer | 27 | Plumas | - | Riverside | 118 | Sacramento | 277 | San Benito | - | San Bernardino | 170 | San Diego | 40 | San Francisco | - | San Joaquin | 207 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | 1 | Santa Cruz | - | Shasta | - | Sierra | - | Siskiyou | - | Solano | 1 | Sonoma | 2 | Stanislaus | 75 | Sutter | 12 | Tehama | - | Trinity | - | Tulare | 64 | Tuolumne | - | Ventura | - | Yolo | 19 | Yuba | 1 |
Total | 2001 |
County | Sentinel chickens | Alameda | - | Alpine | - | Amador | - | Butte | 31 | Calaveras | 9 | Colusa | 1 | Contra Costa | 15 | Del Norte | - | El Dorado | - | Fresno | 24 | Glenn | 5 | Humboldt | - | Imperial | 26 | Inyo | - | Kern | 18 | Kings | 1 | Lake | 1 | Lassen | - | Los Angeles | 133 | Madera | 2 | Marin | - | Mariposa | - | Mendocino | - | Merced | 3 | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 3 | Placer | 11 | Plumas | - | Riverside | 118 | Sacramento | 7 | San Benito | - | San Bernardino | 61 | San Diego | 15 | San Francisco | - | San Joaquin | 18 | San Luis Obispo | - | San Mateo | - | Santa Barbara | - | Santa Clara | - | Santa Cruz | - | Shasta | 3 | Sierra | - | Siskiyou | - | Solano | 7 | Sonoma | - | Stanislaus | 38 | Sutter | 9 | Tehama | - | Trinity | - | Tulare | 20 | Tuolumne | - | Ventura | 4 | Yolo | - | Yuba | 1 |
Total | 584 |
County | Squirrels | Alameda | 1 | Alpine | - | Amador | - | Butte | - | Calaveras | - | Colusa | - | Contra Costa | 6 | Del Norte | - | El Dorado | - | Fresno | 1 | Glenn | - | Humboldt | - | Imperial | - | Inyo | - | Kern | - | Kings | - | Lake | - | Lassen | - | Los Angeles | 14 | Madera | - | Marin | - | Mariposa | - | Mendocino | - | Merced | - | Modoc | - | Mono | - | Monterey | - | Napa | - | Nevada | - | Orange | 4 | Placer | - | Plumas | - | Riverside | - | Sacramento | 1 | San Benito | - | San Bernardino | 5 | 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 | 32 |
WNV Activity by County Printable Version
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 every Friday by 4pm.
- View Printable Map -
Total Counties with WNV in 2008:
49
Alameda, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Ventura, Yolo, and Yuba.
WNV News
| WNV-Carrying Mosquitoes Still a Threat in the Fall 09/26/08 Summer has ended but mosquitoes are still active. Californians need to continue to use repellent and protect themselves from mosquitoes that carry West Nile virus. The risk of getting West Nile virus is higher in southern California this year than the last few years. Mosquito and vector control agencies throughout the state continue to monitor and control West Nile virus. | | CALIFORNIA DEPARTMENT OF PUBLIC HEALTH ANNOUNCES FIRST DEATH FROM WEST NILE VIRUS IN 2008 08/25/08 SACRAMENTO - Dr. Mark Horton, director of the California Department of Public Health (CDPH), announced today that West Nile virus (WNV) has claimed the life of an elderly woman in Orange County. She is the first death this year in California from complications associated with the virus. |
- view news and press release archives -
National Activity
As of December 16, 2008, 1,370 human cases had been reported nationwide this year in the following 42 states: Alabama (21), Arizona (109), Arkansas (9), California (411), Colorado (95), Connecticut (8), Delaware (1), Florida (2), Georgia (8), Idaho (33), Illinois (19), Indiana (3), Iowa (10), Kansas (38), Kentucky (3), Louisiana (36), Maryland (14), Michigan (17), Minnesota (21), Mississippi (99), Missouri (19), Montana (5), Nebraska (49), Nevada (16), New Jersey (7), New Mexico (9), New York (44), North Dakota (43), Ohio (20), Oklahoma (7), Oregon (16), Pennsylvania (14), Rhode Island (1), South Dakota (39), Tennessee (17), Texas (62), Utah (26), Virginia (1), Washington (2), West Virginia (1), Wisconsin (7), and Wyoming (8). Of the 1,370 individuals, 640 (47%) had neuroinvasive illness. As of December 16, 37 fatalities had been reported in Arizona (5), California (13), Colorado (1), Idaho (1), Iowa (1), Illinois (1), Mississippi (3), Missouri (1), New Jersey (1), New York (6), Ohio (1), Pennsylvania (1), Texas (1), and Wisconsin (1). At this time last year, 3,404 human cases had been reported nationwide.
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human cases YTD: 433 Counties: 26 Fifteen WNV-related fatalities have been reported in Fresno (1), Los Angeles (6), Orange (4), Riverside (4) and San Bernardino (1) counties. A total of 69 WNV-positive blood donation samples have been reported this year; 21 of the individuals reported symptoms and were reclassified as cases. 433 human cases from 26 counties have tested positive for WNV in 2008.
horses YTD: 32 Counties: 14 32 horses from 14 counties have tested positive for WNV in 2008.
dead birds YTD: 2,530 Counties: 46 2,530 dead birds from 46 counties have tested positive for WNV in 2008.
mosquito samples YTD: 2,001 Counties: 26 2,001 mosquito samples from 26 counties have tested positive for WNV in 2008.
sentinel chickens YTD: 584 Counties: 27 There have been a total of 129 positive flocks in 2008 from the following counties: Butte (6), Calaveras (1), Colusa (1), Contra Costa (2), Fresno (5), Glenn (1), Imperial (6), Kern (4), Kings (1), Lake (1), Los Angeles (34), Madera (1), Merced (2), Orange (1), Placer (4), Riverside (18), Sacramento (3), San Bernardino (12), San Diego (3), San Joaquin (2), Shasta (1), Solano (3), Stanislaus (7), Sutter (3), Tulare (4), Ventura (2), and Yuba (1). 584 sentinel chickens from 27 counties have tested positive for WNV in 2008.
squirrels YTD: 32 Counties: 7 32 squirrels from 7 counties have tested positive for WNV in 2008.
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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 |
Total |
Human cases (fatal) |
31 (0) |
779 (29) |
880 (19) |
278 (7) |
380 (21) |
2,320 (76) |
Click here for a printable version of the 2004-2008 WNV Case Summary |
Element |
2003 |
2004 |
2005 |
2006 |
2007 |
Total |
Horses |
12 |
540 |
456 |
58 |
28 |
1,083 |
Dead birds |
96 |
3,232 |
3,046 |
1,446 |
1,395 |
9,215 |
Mosquito samples |
32 |
1,136 |
1,242 |
832 |
1,007 |
4,249 |
Sentinel chickens |
70 |
809 |
1,053 |
640 |
510 |
3,082 |
Squirrels |
- |
49 |
48 |
32 |
26 |
155 |
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 2007 YTD
As of 01/02/09 | 2007 | 2008 |
Counties | 51 | 49 |
Human cases | 380 | 433 | Horses | 28 | 32 | Dead birds | 1395 | 2530 | Mosquito samples | 1007 | 2001 | Sentinel chickens | 510 | 584 | Squirrels | 26 | 32 |
2007 YTD - Year to date corresponds to the same time last year.
- view all 2007 YTD activity -
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WNV Reports
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