Case Counts by County

CountyDead birds
Alameda13
Alpine-
Amador-
Butte37
Calaveras-
Colusa3
Contra Costa7
Del Norte-
El Dorado2
Fresno3
Glenn4
Humboldt2
Imperial-
Inyo-
Kern1
Kings3
Lake5
Lassen-
Los Angeles12
Madera1
Marin3
Mariposa-
Mendocino-
Merced2
Modoc-
Mono-
Monterey-
Napa7
Nevada9
Orange27
Placer13
Plumas-
Riverside44
Sacramento75
San Benito-
San Bernardino13
San Diego129
San Francisco-
San Joaquin12
San Luis Obispo-
San Mateo10
Santa Barbara-
Santa Clara106
Santa Cruz-
Shasta13
Sierra-
Siskiyou-
Solano8
Sonoma5
Stanislaus13
Sutter16
Tehama-
Trinity2
Tulare22
Tuolumne-
Ventura8
Yolo49
Yuba6
Total685

WNV Activity by County
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2015 | 2014 | 2013
2012 | 2011 | 2010
2009 | 2008 | 2007

Press Releases

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH ANNOUNCES FIRST DEATH FROM WEST NILE VIRUS IN 2008

Aug 25, 2008

NUMBER: PH08-46
FOR RELEASE: IMMEDIATE
CONTACT: Suanne Buggy or Lea Brooks
http://www.cdph.ca.gov        
(916) 440-7259

SACRAMENTO - Dr. Mark Horton, director of the California Department of Public Health (CDPH), announced today that West Nile virus (WNV) has claimed the life of an elderly woman in Orange County. She is the first death this year in California from complications associated with the virus.

"This unfortunate death reminds us that we must take precautions to protect ourselves and our families from mosquito bites," Horton said. "Californians should use insect repellent and eliminate all sources of standing water that can support mosquito breeding."

To date in 2008, WNV activity has been detected in 38 of California's 58 counties. In addition to the death, 96 people have become ill with WNV infections in 13 counties. WNV also has been detected in 1,295 dead birds, 1,101 mosquito samples, five horses, 109 sentinel chickens and nine squirrels.

Last year at this time, WNV activity had been detected in 48 counties and 148 people had been confirmed with WNV infections, including nine deaths.

WNV is transmitted to humans and animals through a mosquito bite. Mosquitoes become infected when they feed on infected birds.

Most individuals who are infected with WNV will not experience any illness. However, individuals 50 years of age and older have a higher chance of getting sick and are more likely to develop serious symptoms when infected with WNV. Recent data also indicate that those with diabetes and/or hypertension are at greatest risk for serious illness.

The most effective ways for individuals to prevent exposure to mosquito bites and WNV are:

  • Apply insect repellent containing DEET, picaradin or oil of lemon eucalyptus, according to label instructions.
  • Ensure doors and windows have tight-fitting screens. Repair or replace screens that have tears or holes.
  • Eliminate all sources of standing water that can support mosquito breeding.
  • Wear clothing that reduces the risk of skin exposure and avoid spending time outside at dusk and dawn when mosquitoes are most active.
Most individuals who are infected with WNV will not experience any illness. Individuals 50 years of age and older have a higher chance of getting sick and are more likely to develop serious symptoms when infected with WNV. Recent data also indicate that those with diabetes and/or hypertension are at greatest risk for serious illness.

California's WNV Web site - http://www.westnile.ca.gov - includes the latest information on WNV activity in the state. In order to help identify WNV activity, Californians are encouraged to report all dead birds and dead tree squirrels on the Web site or by calling toll-free 1-877-WNV-BIRD (968-2473).

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

As of Sep 04, 2015201520145Y AVG
Counties403734
Human cases10817876
Dead birds6851736841
Mosquito samples230324841702
Sentinel chickens193242191
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

09.04 Arbovirus Bulletin #27
09.04 2015 YTD WNV Activity Map
09.01 2015 US Arboviral Activity Update

Humans

09.02 2015 Human WNV Incidence Report
09.02 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

09.04Positive Species for 2015
09.04Positive Counts by City/County for 2015
09.04Reported, Tested, Positive 2015

Mosquitoes

09.04 AMOR - EVS Week 34
09.04 AMOR - GRAVID Week 34
09.04 AMOR - NJLT Week 34
- view report archives -