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

Case Counts by County

CountyDead birds
Alameda2
Alpine-
Amador-
Butte5
Calaveras-
Colusa1
Contra Costa19
Del Norte-
El Dorado2
Fresno5
Glenn2
Humboldt1
Imperial-
Inyo-
Kern3
Kings1
Lake5
Lassen-
Los Angeles100
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey1
Napa-
Nevada1
Orange55
Placer4
Plumas-
Riverside41
Sacramento86
San Benito-
San Bernardino45
San Diego41
San Francisco1
San Joaquin7
San Luis Obispo6
San Mateo1
Santa Barbara1
Santa Clara12
Santa Cruz1
Shasta2
Sierra-
Siskiyou-
Solano4
Sonoma5
Stanislaus6
Sutter3
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura2
Yolo14
Yuba6
Total502

WNV Activity by County
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2007

Press Releases

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

Jul 24, 2007

NUMBER: PH07-08
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 second death in 2007 of a Californian due to complications associated with West Nile virus (WNV). The fatality was an 85-year-old Kern County man. The first fatality, an elderly Kern County woman, was announced on July 13.

"The death of this fellow Californian is a sad and sobering reminder of the risk posed by mosquito bites and West Nile virus," Horton said. "We should all take precautionary measures to protect ourselves against mosquito bites, especially during the summer months."

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.

WNV activity has been detected in 36 of California's 58 counties. To date in 2007, 36 individuals, including the two who died in Kern County, have become ill after exposure to WNV.

Kern County accounts for 28 of the reported WNV illnesses. Fresno, Glenn, Imperial, Mendocino, Merced and San Joaquin counties have each reported one illness, while Stanislaus County has reported two. WNV also has been detected in 355 dead birds, 221 mosquito samples, four horses, 22 chickens and five squirrels.

"The recent increase in West Nile virus-related illnesses follows an established pattern," Horton said. "As the temperature rises, so does the spread of West Nile virus from mosquitoes to people and animals."

In anticipation of warmer temperatures, mosquito control efforts have intensified throughout the Central Valley. Aerial spraying to control mosquitoes has been conducted in selected areas of San Joaquin County, and many counties have started ground-based "fogging." In addition, many local agencies are increasing their mosquito control efforts in underground storm drains and surveying backyards via helicopter for neglected swimming pools that can breed thousands of mosquitoes, an increasing problem due to the rise this year in home foreclosures.

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.

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.

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 Nov 17, 2017201720165Y AVG
Counties473841
Human cases465395504
Dead birds50213461592
Mosquito samples336035063104
Sentinel chickens304343448
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

11.17 Arbovirus Bulletin #33
11.17 2017 YTD WNV Activity Map
11.14 2017 US Arboviral Activity Update

Humans

11.15 2017 Human WNV Incidence Report
11.15 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

11.17Positive Counts by City/County for 2017
11.17Positive Species for 2017
11.17Reported, Tested, Positive 2017

Mosquitoes

11.09 AMOR - EVS Week 44
11.09 AMOR - GRAVID Week 44
11.09 AMOR - NJLT Week 44
- view report archives -