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Maps and Data  > 2006 WNV Activity by County 01/26/07

West Nile virus has been detected in 54/ 58 California Counties in 2006.

2006 WNV Activity by County

County Human Cases Horses Dead Birds Mosquito Samples Sentinel Chickens Squirrels
State Totals 276 58 1446 832 640 32
Alameda 1 - 41 9 - 2
Alpine - - - - - -
Amador - - 2 - - -
Butte 31 - 40 1 49 1
Calaveras - - 2 2 - -
Colusa 4 - 9 - 1 -
Contra Costa 8 1 93 18 25 18
Del Norte - - - - - -
El Dorado 2 - 19 2 - -
Fresno 11 5 75 40 37 -
Glenn 12 - 35 1 10 -
Humboldt - - 2 - - -
Imperial 1 - - 14 57 -
Inyo - - 8 3 - -
Kern 49 4 24 230 92 -
Kings 1 - 13 34 25 -
Lake 2 2 8 12 6 -
Lassen - 7 3 3 - -
Los Angeles 13 - 98 78 38 1
Madera - - 3 4 9 -
Marin 1 1 9 2 2 1
Mariposa - - 1 - - -
Mendocino - 2 7 - - -
Merced 4 3 41 8 15 -
Modoc 2 2 2 - - -
Mono 1 - 1 - - -
Monterey - - 5 - - -
Napa 1 - 8 - - -
Nevada 1 - 4 - - -
Orange 6 - 49 14 - -
Placer 8 1 13 23 11 -
Plumas - - - - - -
Riverside 4 - 3 31 27 -
Sacramento 15 1 89 34 13 -
San Benito - - 1 - - -
San Bernardino 3 - 33 25 26 3
San Diego 1 3 26 - - -
San Francisco - - 3 - - -
San Joaquin 8 2 47 40 19 -
San Luis Obispo 1 5 14 - - -
San Mateo - - 7 - - 2
Santa Barbara - 2 19 1 - -
Santa Clara 5 1 224 9 1 2
Santa Cruz - - 7 - - -
Shasta 4 4 89 7 4 2
Sierra - - - - - -
Siskiyou - - 1 - - -
Solano 6 - 21 1 22 -
Sonoma - 1 23 1 1 -
Stanislaus 11 3 77 51 45 -
Sutter 12 1 2 55 36 -
Tehama 6 2 12 - 3 -
Trinity - - 1 - - -
Tulare 6 3 14 8 30 -
Tuolumne - - 1 - - -
Ventura 3 - 62 2 1 -
Yolo 27 - 54 64 26 -
Yuba 5 2 1 6 9 -
State Totals 276 58 1446 832 640 32


* A mosquito sample is a collection of approximately 50 mosquitoes that are tested together for West Nile virus.

 

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