Case Counts by County

CountyDead birds
Alameda5
Alpine-
Amador-
Butte8
Calaveras-
Colusa3
Contra Costa2
Del Norte-
El Dorado1
Fresno-
Glenn3
Humboldt1
Imperial-
Inyo-
Kern1
Kings1
Lake-
Lassen-
Los Angeles2
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange5
Placer1
Plumas-
Riverside9
Sacramento21
San Benito-
San Bernardino1
San Diego62
San Francisco-
San Joaquin6
San Luis Obispo-
San Mateo4
Santa Barbara-
Santa Clara45
Santa Cruz-
Shasta3
Sierra-
Siskiyou-
Solano4
Sonoma2
Stanislaus8
Sutter9
Tehama-
Trinity-
Tulare16
Tuolumne-
Ventura1
Yolo16
Yuba4
Total247

WNV Activity by County
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2009 | 2008 | 2007

Press Releases

CALIFORNIA DEPARTMENT OF PUBLIC HEALTH ANNOUNCES FIRST CONFIRMED HUMAN WEST NILE VIRUS CASE IN 2008

Jun 20, 2008

NUMBER: PH08-34
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), today announced that a Tulare County woman has tested positive for West Nile virus (WNV) infection, the first reported human case in California this year. She was not hospitalized and is recovering.

"The first human West Nile virus infection of 2008 underscores the importance of taking precautions to protect from mosquito bites," Horton said. "Californians should use insect repellent and eliminate all sources of standing water that can support mosquito breeding."

To date this year, WNV activity has been detected in 19 of California's 58 counties. In 2007, the first human case in California was reported on June 20th.

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. 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:


  • DEET - Apply inspect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR 3535 according to label instructions. Repellents keep the mosquitoes from biting you. DEET can be used safely on infants and children 2 months of age and older.

  • DRESS - Wear clothing that reduces the risk of skin exposure.

  • DAWN AND DUSK - Mosquitoes that carry WNV bite in the early morning and evening so it is important to wear repellent at this time. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.

  • DRAIN - Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flower pots, old car tires, rain gutters and pet bowls. If you have a pond, use mosquito fish or commercially available products to eliminate mosquito larvae.

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 Jul 24, 2015201520145Y AVG
Counties353325
Human cases1135
Dead birds247710308
Mosquito samples756771477
Sentinel chickens431418
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

07.27 2015 YTD WNV Activity Map
07.24 Arbovirus Bulletin #21
07.17 Arbovirus Bulletin #20

Humans

07.24 2003-2015 WNV Case Summary
07.22 2015 Human WNV Incidence Report
03.09 2014 Human WNV Incidence Report

Dead Birds

07.27Positive Species for 2015
07.27Positive Counts by City/County for 2015
07.27Reported, Tested, Positive 2015

Mosquitoes

07.17 AMOR - EVS Week 27
07.17 AMOR - GRAVID Week 27
07.17 AMOR - NjLT Week 27
- view report archives -