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West Nile Virus
Mosquito
2009
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West Nile Virus:  California - Mosquito
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Siskiyou County Del Norte County Modoc County Humboldt County Trinity County Lassen County Shasta County (2) Humboldt County Tehama County Plumas County Butte County (5) Mendocino County Glenn County Sierra County Yuba County (1) Lake County (2) Nevada County Colusa County Placer County (40) Sutter County (24) El Dorado County Alpine County Yolo County (16) Napa County Sonoma County Sacramento County (36) Mono County (1) Amador County Solano County (2) Calaveras County Tuolumne County Marin County San Joaquin County (84) Solano County (2) Solano County (2) Contra Costa County (17) Solano County (2) Stanislaus County (94) Sacramento County (36) Contra Costa County (17) Alameda County (1) Mariposa County Marin County San Francisco County San Francisco County Alameda County (1) San Francisco County Madera County (3) San Francisco County San Francisco County San Francisco County San Mateo County San Francisco County San Francisco County Merced County (11) Fresno County (132) Santa Clara County (14) Inyo County Santa Cruz County San Benito County Monterey County Tulare County (131) Kings County (105) San Bernardino County (52) San Luis Obispo County Kern County (138) Santa Barbara County Ventura County Los Angeles County (94) Riverside County (27) Santa Barbara County Santa Barbara County Santa Barbara County Santa Barbara County Ventura County Ventura County Ventura County Orange County (16) Los Angeles County (94) San Diego County (5) Santa Barbara County Los Angeles County (94) Imperial County (3) Ventura County Los Angeles County (94) Los Angeles County (94) San Diego County (5) Navigate to Arizona page Navigate to Idaho page Navigate to Nevada page Navigate to Oregon page Navigate to Utah page Navigate to Wyoming page
Map Scalebar 350 km
Cumulative 2009 Data as of 3 am, Nov 24, 2009*
These data are provisional and may be revised or adjusted in the future.
[Epi curve - Vertical bar graph showing number of incidents for each of 52 weeks]
Cumulative Mosquito Infections by County - California, 2009
Alameda County1
Butte County5
Contra Costa County17
Fresno County132
Imperial County3
Kern County138
Kings County105
Lake County2
Los Angeles County94
Madera County3
Merced County11
Mono County1
Orange County16
Placer County40
Riverside County27
Sacramento County36
San Bernardino County52
San Diego County5
San Joaquin County84
Santa Clara County14
Shasta County2
Solano County2
Stanislaus County94
Sutter County24
Tulare County131
Yolo County16
Yuba County1
Cumulative Total Entire State: 1056
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Map Legend
* States and counties in yellow either did not perform surveillance or did not report any positive test results from their surveillance.