CA Dept. of Public Health UC Davis Arbovirus Research and Training Mosquito and Vector Control Assoc. of CA

Case Counts by County

CountyDead birds
Alameda-
Alpine-
Amador-
Butte1
Calaveras-
Colusa-
Contra Costa1
Del Norte-
El Dorado-
Fresno2
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles24
Madera1
Marin1
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange6
Placer-
Plumas-
Riverside1
Sacramento109
San Benito-
San Bernardino-
San Diego100
San Francisco-
San Joaquin2
San Luis Obispo-
San Mateo-
Santa Barbara-
Santa Clara19
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus2
Sutter2
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura4
Yolo1
Yuba-
Total277

WNV Activity by County
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2010 | 2009 | 2008
2007

News

West Nile Virus Activity Increases in California

Jul 5, 2007

As of July 5, 25 counties have detected West Nile Virus (WNV) activity. Three human WNV cases have been reported in Kern County and two equine cases in Sonoma County.

Surveillance for WNV in 2007 has identified 159 West Nile Virus positive dead birds from 20 counties, four flocks of WNV positive sentinel chickens in three counties and 72 WNV positive mosquito pools from nine counties. These surveillance numbers could indicate that the mosquito and vector control agencies may have another busy year battling WNV carrying mosquitoes.

The public is urged to follow the three "Ds" to help protect themselves and their families from WNV:

  • To help protect yourself and others use repellents that contain DEET, Picaridin or oil of lemon eucalyptus before going outdoors.

  • Fix or replace missing or torn door and window screens to keep mosquitoes out of your home. Offer to help neighbors fix their screens.

  • DRAIN standing water in and around your yard so mosquitoes will not have a place to lay their eggs. Change water in pet dishes, birdbaths, plants and flower containers weekly. Keep gutters free from leaves and debris. Help others in your neighborhood to "mosquito proof" their yards, too.

Having problems with mosquitoes?

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Compared to previous year and previous five-year average to date

As of Jun 24, 2016201620155Y AVG
Counties213120
Human cases001
Dead birds277102106
Mosquito samples264180122
Sentinel chickens431
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

06.24 Arbovirus Bulletin #16
06.24 2016 YTD WNV Activity Map
06.17 Arbovirus Bulletin #15

Humans

03.21 2015 Human WNV Incidence Report
03.21 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

06.24Positive Species for 2016
06.24Reported, Tested, Positive 2016
06.24Positive Counts by City/County for 2016

Mosquitoes

06.24 AMOR - EVS Week 24
06.24 AMOR - GRAVID Week 24
06.24 AMOR - NJLT Week 24
- view report archives -