Case Counts by County

CountyDead birds
Alameda5
Alpine-
Amador-
Butte8
Calaveras-
Colusa3
Contra Costa2
Del Norte-
El Dorado1
Fresno-
Glenn3
Humboldt1
Imperial-
Inyo-
Kern1
Kings1
Lake-
Lassen-
Los Angeles2
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange5
Placer1
Plumas-
Riverside9
Sacramento21
San Benito-
San Bernardino1
San Diego62
San Francisco-
San Joaquin6
San Luis Obispo-
San Mateo4
Santa Barbara-
Santa Clara45
Santa Cruz-
Shasta3
Sierra-
Siskiyou-
Solano4
Sonoma2
Stanislaus8
Sutter9
Tehama-
Trinity-
Tulare16
Tuolumne-
Ventura1
Yolo16
Yuba4
Total247

WNV Activity by County
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2015 | 2014 | 2013
2012 | 2011 | 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.

Locate Your Local Mosquito and Vector Control Agency
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Compared to previous year and previous five-year average to date

As of Jul 24, 2015201520145Y AVG
Counties353325
Human cases1135
Dead birds247710308
Mosquito samples756771477
Sentinel chickens431418
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

07.28 2015 US Arboviral Activity Update
07.27 2015 YTD WNV Activity Map
07.24 Arbovirus Bulletin #21

Humans

07.24 2003-2015 WNV Case Summary
07.22 2015 Human WNV Incidence Report
03.09 2014 Human WNV Incidence Report

Dead Birds

07.27Positive Species for 2015
07.27Positive Counts by City/County for 2015
07.27Reported, Tested, Positive 2015

Mosquitoes

07.17 AMOR - EVS Week 27
07.17 AMOR - GRAVID Week 27
07.17 AMOR - NjLT Week 27
- view report archives -