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

Case Counts by County

CountyDead birds
Alameda1
Alpine-
Amador-
Butte2
Calaveras-
Colusa1
Contra Costa5
Del Norte-
El Dorado1
Fresno2
Glenn-
Humboldt-
Imperial-
Inyo-
Kern3
Kings1
Lake1
Lassen-
Los Angeles32
Madera-
Marin-
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey1
Napa-
Nevada1
Orange15
Placer1
Plumas-
Riverside23
Sacramento40
San Benito-
San Bernardino27
San Diego14
San Francisco-
San Joaquin6
San Luis Obispo-
San Mateo1
Santa Barbara-
Santa Clara5
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus3
Sutter1
Tehama-
Trinity-
Tulare8
Tuolumne-
Ventura-
Yolo1
Yuba4
Total203

WNV Activity by County
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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 Aug 18, 2017201720165Y AVG
Counties323536
Human cases414656
Dead birds2031010872
Mosquito samples204925651820
Sentinel chickens92161149
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

08.18 Arbovirus Bulletin #20
08.18 2017 YTD SLEV Activity Map
08.18 2017 YTD WNV Activity Map

Humans

08.16 2017 Human WNV Incidence Report
08.16 2003-2017 WNV Case Summary
02.08 2016 Human WNV Incidence Report

Dead Birds

08.18Positive Counts by City/County for 2017
08.18Positive Species for 2017
08.18Reported, Tested, Positive 2017

Mosquitoes

08.18 AMOR - EVS Week 32
08.18 AMOR - GRAVID Week 32
08.18 AMOR - NJLT Week 32
- view report archives -