Case Counts by County

CountyDead birds
Alameda86
Alpine-
Amador-
Butte20
Calaveras-
Colusa4
Contra Costa38
Del Norte-
El Dorado4
Fresno9
Glenn4
Humboldt2
Imperial-
Inyo-
Kern3
Kings3
Lake18
Lassen-
Los Angeles60
Madera5
Marin3
Mariposa-
Mendocino-
Merced7
Modoc-
Mono-
Monterey-
Napa12
Nevada-
Orange306
Placer38
Plumas-
Riverside1
Sacramento275
San Benito-
San Bernardino13
San Diego7
San Francisco-
San Joaquin47
San Luis Obispo-
San Mateo14
Santa Barbara-
Santa Clara852
Santa Cruz1
Shasta5
Sierra-
Siskiyou-
Solano32
Sonoma20
Stanislaus43
Sutter19
Tehama-
Trinity-
Tulare40
Tuolumne-
Ventura5
Yolo67
Yuba16
Total2079

WNV Activity by County
Printable Version
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 Sep 19, 2014201420135Y AVG
Counties384137
Human cases31115095
Dead birds20791067727
Mosquito samples295223141749
Sentinel chickens328374301
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2013 YTD activity -

WNV Reports

Weekly Report

09.19 Arbovirus Bulletin #31
09.19 2014 YTD WNV Activity Map
09.16 2014 US Arboviral Activity Update

Humans

09.15 2014 Human WNV Incidence Report
09.15 2003-2014 WNV Case Summary
08.12 2013 Human WNV Incidence Report

Dead Birds

09.19Reported, Tested, Positive 2014
09.19Positive Counts by City/County for 2014
09.19Positive Species for 2014

Mosquitoes

09.18 AMOR - EVS Week 37
09.18 AMOR - GRAVID Week 37
09.18 AMOR - NJLT Week 37
- view report archives -