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

Case Counts by County

CountyDead birds
Alameda1
Alpine-
Amador-
Butte2
Calaveras-
Colusa1
Contra Costa5
Del Norte-
El Dorado1
Fresno2
Glenn-
Humboldt-
Imperial-
Inyo-
Kern3
Kings1
Lake1
Lassen-
Los Angeles32
Madera-
Marin-
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey1
Napa-
Nevada1
Orange15
Placer1
Plumas-
Riverside23
Sacramento40
San Benito-
San Bernardino27
San Diego14
San Francisco-
San Joaquin6
San Luis Obispo-
San Mateo1
Santa Barbara-
Santa Clara5
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus3
Sutter1
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura-
Yolo1
Yuba4
Total203

WNV Activity by County
Printable Version
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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.

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

As of Aug 18, 2017201720165Y AVG
Counties323536
Human cases414656
Dead birds2031010872
Mosquito samples204925651820
Sentinel chickens92161149
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

08.18 Arbovirus Bulletin #20
08.18 2017 YTD SLEV Activity Map
08.18 2017 YTD WNV Activity Map

Humans

08.16 2017 Human WNV Incidence Report
08.16 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

08.18Positive Counts by City/County for 2017
08.18Positive Species for 2017
08.18Reported, Tested, Positive 2017

Mosquitoes

08.18 AMOR - EVS Week 32
08.18 AMOR - GRAVID Week 32
08.18 AMOR - NJLT Week 32
- view report archives -