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

Case Counts by County

CountyDead birds
Alameda19
Alpine-
Amador-
Butte4
Calaveras-
Colusa-
Contra Costa13
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern1
Kings-
Lake-
Lassen-
Los Angeles19
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange12
Placer44
Plumas-
Riverside6
Sacramento241
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin16
San Luis Obispo-
San Mateo5
Santa Barbara-
Santa Clara53
Santa Cruz2
Shasta5
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter4
Tehama-
Trinity-
Tulare-
Tuolumne1
Ventura-
Yolo41
Yuba-
Total490

WNV Activity by County
Printable Version
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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 Oct 19, 2018201820175Y AVG
Counties394441
Human cases143360406
Dead birds4904741308
Mosquito samples195233043137
Sentinel chickens152296376
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

10.19 Arbovirus Bulletin #29
10.19 2018 YTD SLEV Activity Map
10.19 2018 YTD WNV Activity Map

Humans

10.18 2018 Human WNV Incidence Report
10.18 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

10.19Reported, Tested, Positive 2018
10.19Positive Species for 2018
10.19Positive Counts by City/County for 2018

Mosquitoes

10.19 AMOR - EVS Week 41
10.19 AMOR - GRAVID Week 41
10.19 AMOR - NJLT Week 41
- view report archives -