Case Counts by County

CountyDead birds
Alameda2
Alpine-
Amador-
Butte1
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado1
Fresno-
Glenn1
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles2
Madera1
Marin1
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange1
Placer-
Plumas-
Riverside4
Sacramento5
San Benito-
San Bernardino-
San Diego33
San Francisco-
San Joaquin1
San Luis Obispo-
San Mateo3
Santa Barbara-
Santa Clara21
Santa Cruz-
Shasta2
Sierra-
Siskiyou-
Solano1
Sonoma2
Stanislaus4
Sutter2
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura1
Yolo3
Yuba1
Total101

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 Jun 26, 2015201520145Y AVG
Counties312116
Human cases011
Dead birds10119791
Mosquito samples18012390
Sentinel chickens311
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

06.26 Arbovirus Bulletin #17
06.26 2015 YTD WNV Activity Map
06.23 2015 US Arboviral Activity Update

Humans

04.02 2003-2014 WNV Case Summary
03.09 2014 Human WNV Incidence Report
08.12 2013 Human WNV Incidence Report

Dead Birds

06.26Positive Species for 2015
06.26Positive Counts by City/County for 2015
06.26Reported, Tested, Positive 2015

Mosquitoes

06.26 AMOR - EVS Week 24
06.26 AMOR - GRAVID Week 24
06.26 AMOR - NJLT Week 24
- view report archives -