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

Case Counts by County

CountyDead birds
Alameda11
Alpine-
Amador-
Butte22
Calaveras-
Colusa-
Contra Costa33
Del Norte-
El Dorado4
Fresno6
Glenn4
Humboldt-
Imperial-
Inyo-
Kern-
Kings4
Lake5
Lassen-
Los Angeles124
Madera5
Marin5
Mariposa-
Mendocino-
Merced5
Modoc-
Mono-
Monterey-
Napa1
Nevada2
Orange91
Placer30
Plumas-
Riverside16
Sacramento411
San Benito-
San Bernardino5
San Diego264
San Francisco-
San Joaquin37
San Luis Obispo-
San Mateo15
Santa Barbara-
Santa Clara89
Santa Cruz2
Shasta3
Sierra-
Siskiyou-
Solano13
Sonoma8
Stanislaus14
Sutter10
Tehama-
Trinity-
Tulare3
Tuolumne-
Ventura34
Yolo72
Yuba4
Total1352

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 Jan 02, 2017201620155Y AVG
Counties394133
Human cases442782487
Dead birds135213491337
Mosquito samples352833292409
Sentinel chickens343449383
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

03.08 2016 YTD WNV Activity Map
01.17 2016 US Arboviral Activity Update
12.16 Arbovirus Bulletin #40

Humans

02.08 2016 Human WNV Incidence Report
02.08 2003-2016 WNV Case Summary
03.21 2015 Human WNV Incidence Report

Dead Birds

03.08Positive Species for 2016
03.08Reported, Tested, Positive 2016
03.08Positive Counts by City/County for 2016

Mosquitoes

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