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-
Butte-
Calaveras-
Colusa1
Contra Costa-
Del Norte-
El Dorado-
Fresno1
Glenn-
Humboldt-
Imperial-
Inyo-
Kern3
Kings-
Lake1
Lassen-
Los Angeles13
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada1
Orange7
Placer1
Plumas-
Riverside11
Sacramento21
San Benito-
San Bernardino11
San Diego5
San Francisco-
San Joaquin2
San Luis Obispo-
San Mateo1
Santa Barbara-
Santa Clara-
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus-
Sutter-
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura-
Yolo-
Yuba-
Total89

WNV Activity by County
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2007

Press Releases

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH ANNOUNCES FIRST DEATH FROM WEST NILE VIRUS IN 2007

Jul 13, 2007

NUMBER: PH07-06
FOR RELEASE: IMMEDIATE
CONTACT: Suanne Buggy or Norma Arceo
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 Kern County. She is the first to die 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. Even though the likelihood of serious illness from West Nile virus is low for most people, all Californians should take every precaution to reduce their risk of exposure," Horton said.

To date in 2007, WNV activity has been detected in 30 of California?s 58 counties. In addition to the death, seven people have become ill with WNV infections in Kern County and one in San Joaquin County.

WNV also has been detected in 230 dead birds, 182 mosquito samples, two horses, 13 chickens and three squirrels.

California has one of the most comprehensive WNV surveillance and control systems in the United States. In recognition of the key role these systems play in controlling WNV, Governor Arnold Schwarzenegger included $3 million in one-time supplemental funds in his 2006-2007 budget that were recently distributed to 61 local agencies to enhance mosquito control and abatement efforts.

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

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.

The most effective ways for individuals to prevent exposure to 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.

For more information about WNV and to report dead birds and tree squirrels, visit http://www.westnile.ca.gov or call 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 Jul 21, 2017201720165Y AVG
Counties253231
Human cases404
Dead birds89658456
Mosquito samples8951157766
Sentinel chickens213027
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

07.24 Arbovirus Bulletin #16
07.21 2017 YTD WNV Activity Map
07.18 2017 US Arboviral Activity Update

Humans

07.19 2017 Human WNV Incidence Report
07.19 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

07.21Positive Counts by City/County for 2017
07.21Positive Species for 2017
07.21Reported, Tested, Positive 2017

Mosquitoes

07.21 AMOR - EVS Week 28
07.21 AMOR - GRAVID Week 28
07.21 AMOR - NJLT Week 28
- view report archives -