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

Case Counts by County

CountyDead birds
Alameda7
Alpine-
Amador-
Butte-
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles2
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange-
Placer1
Plumas-
Riverside2
Sacramento36
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin1
San Luis Obispo-
San Mateo2
Santa Barbara-
Santa Clara6
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter-
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo5
Yuba-
Total67

WNV Activity by County
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2010 | 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 13, 2018201820175Y AVG
Counties212228
Human cases1043
Dead birds6772307
Mosquito samples171681597
Sentinel chickens71712
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

07.13 Arbovirus Bulletin #15
07.13 2018 YTD SLEV Activity Map
07.13 2018 YTD WNV Activity Map

Humans

07.12 2018 Human WNV Incidence Report
07.12 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

07.13Reported, Tested, Positive 2018
07.13Positive Species for 2018
07.13Positive Counts by City/County for 2018

Mosquitoes

07.13 AMOR - EVS Week 27
07.13 AMOR - GRAVID Week 27
07.13 AMOR - NJLT Week 27
- view report archives -