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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2010 | 2009 | 2008
2007

Press Releases

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH ANNOUNCES THIRD AND FOURTH DEATHS DUE TO WEST NILE VIRUS

Aug 1, 2007

NUMBER: PH07-16
FOR RELEASE: IMMEDIATE
CONTACT: Suanne Buggy or Ken August
http://www.cdph.ca.gov        
(916) 440-7259

SACRAMENTO - Dr. Mark Horton, director of the California Department of Public Health (CDPH), today announced the third and fourth deaths in 2007 of Californians due to complications associated with West Nile virus (WNV). An elderly San Joaquin County man and an elderly Colusa County woman have both died of West Nile neuroinvasive disease. The two previous fatalities involved an elderly Kern County man and woman.

"The unfortunate deaths of these Californians remind us that we must take precautionary measures to protect ourselves against mosquito bites and West Nile virus, especially during the summer months," said Horton.

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

WNV activity has been detected in 38 of California's 58 counties. To date in 2007, 56 individuals from 13 counties, including the four who have died, have become ill after exposure to WNV.

Kern County accounts for 38 of the reported WNV illnesses. Other counties have reported the following numbers of illnesses: Butte, 2; Colusa, 1; Fresno, 3; Glenn, 1; Imperial, 1; Mendocino, 1; Merced, 1; Sacramento, 1; San Joaquin, 2; Shasta, 1; Sonoma, 1; Stanislaus, 3. WNV also has been detected in 423 dead birds, 317 mosquito samples, five horses, 30 chickens and five squirrels.

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.
  • 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 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 the 2006-2007 budget to supplement existing mosquito control and abatement efforts in high-risk areas and "hot spots." These funds have been distributed to 61 local agencies.

In addition, CDPH uses surveillance and detection technology to track specific areas of WNV activity and alert local agencies so they may target their mosquito control activities.

For more information about WNV and to report dead birds and tree squirrels, visit 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 -