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

Case Counts by County

CountyDead birds
Alameda20
Alpine-
Amador-
Butte4
Calaveras-
Colusa-
Contra Costa13
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern1
Kings-
Lake-
Lassen-
Los Angeles19
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange16
Placer44
Plumas-
Riverside6
Sacramento241
San Benito-
San Bernardino-
San Diego1
San Francisco-
San Joaquin16
San Luis Obispo-
San Mateo5
Santa Barbara-
Santa Clara56
Santa Cruz2
Shasta5
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter4
Tehama-
Trinity-
Tulare-
Tuolumne1
Ventura-
Yolo41
Yuba-
Total499

WNV Activity by County
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2007

Press Releases

STATE HEALTH OFFICER ANNOUNCES FIRST CONFIRMED HUMAN CASE OF WEST NILE VIRUS IN CALIFORNIA THIS YEAR

Jun 20, 2007

NUMBER: 07-51 DATE: June 20, 2007
FOR RELEASE: IMMEDIATE CONTACT: Mike Bowman or
http://www.dhs.ca.gov     Lea Brooks
(916) 440-7660


Contact Person:
Mike Bowman or Lea Brooks
http://www.dhs.ca.gov
(661) 868-0413

FOR IMMEDIATE RELEASE


SACRAMENTO - A 21-year-old Kern County woman has tested positive for West Nile virus (WNV) infection, the first reported human case in California this year, State Public Health Officer Dr. Mark Horton announced today. The woman's symptoms include fever, headache and body aches. She was not hospitalized.

"This first confirmed illness in California due to West Nile virus reminds us that we are moving into the high-risk season," Horton said. "The most important step people can take to prevent exposure to West Nile virus is to protect themselves from being bitten by a mosquito. We are also requesting the public to report dead birds to assist state and local agencies with surveillance efforts."

The positive test was reported to the Kern County Department of Public Health by a local blood bank where the patient had donated blood. She subsequently developed symptoms.

"Special precautions are taken to test all blood donations for West Nile virus, so Californians can be assured that blood supplies are safe," Horton said.

To date this year, WNV has been detected in 13 of California's 58 counties in 57 dead birds, 18 mosquito samples, two sentinel chickens and one horse. In 2006, a total of 278 human WNV cases, including seven deaths, were reported in the 46 of 54 counties that detected WNV activity.

WNV is transmitted to humans and animals through a mosquito bite from a mosquito that has been infected by feeding on an infected bird. Although the risk of serious illness to most people is low, less than 1 percent of individuals will develop a more serious illness.

Horton reminded Californians of three simple ways to protect themselves from WNV:

  • DEET - Apply inspect repellent containing DEET, picaradin or oil of lemon eucalyptus 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.

  • 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.

Governor Arnold Schwarzenegger has invested a total of $15 million over the last two years to enhance mosquito control efforts in California. This funding has supplemented the resources of existing mosquito control programs statewide and expanded efforts in areas of the state not covered to control WNV. This investment in equipment and other products to control mosquitoes continues to benefit mosquito control efforts this year.

For more information about WNV, visit www.westnile.ca.gov. In addition to reporting all dead birds, Californians are encouraged to report dead tree squirrels. The Web site includes information on the most common birds found with WNV. Dead birds and squirrels can be reported on the Web site or by calling (877) 968-2473.

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Compared to previous year and previous five-year average to date

As of Dec 07, 2018201820175Y AVG
Counties414442
Human cases201488548
Dead birds4995061377
Mosquito samples196333703217
Sentinel chickens163305405
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

12.11 2018 US Arboviral Activity Update
12.07 2018 YTD SLEV Activity Map
12.07 2018 YTD WNV Activity Map

Humans

12.06 2018 Human WNV Incidence Report
12.06 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

12.07Reported, Tested, Positive 2018
12.07Positive Species for 2018
12.07Positive Counts by City/County for 2018

Mosquitoes

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