Case Counts by County

CountyDead birds
Alameda54
Alpine-
Amador-
Butte11
Calaveras-
Colusa4
Contra Costa25
Del Norte-
El Dorado1
Fresno8
Glenn4
Humboldt2
Imperial-
Inyo-
Kern3
Kings2
Lake12
Lassen-
Los Angeles21
Madera4
Marin3
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa8
Nevada-
Orange156
Placer19
Plumas-
Riverside-
Sacramento223
San Benito-
San Bernardino8
San Diego4
San Francisco-
San Joaquin36
San Luis Obispo-
San Mateo8
Santa Barbara-
Santa Clara682
Santa Cruz1
Shasta2
Sierra-
Siskiyou-
Solano31
Sonoma12
Stanislaus27
Sutter19
Tehama-
Trinity-
Tulare38
Tuolumne-
Ventura2
Yolo40
Yuba10
Total1480

WNV Activity by County
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2014 | 2013 | 2012
2011 | 2010 | 2009
2008 | 2007

Press Releases

First Two California Fatalities From West Nile Virus in 2011

Oct 3, 2011

CONTACT:
Ken August
Ron Owens
(916) 440-7259

FOR IMMEDIATE RELEASE                                
October 3, 2011                                                                                
PH11-043

SACRAMENTO - A 37-year-old man and an 86-year-old man, both from Kern County, are the first reported fatalities from West Nile virus (WNV) this year, Dr. Ron Chapman, director of the California Department of Public Health, announced today.

"These unfortunate deaths remind us of the potential danger from mosquito bites and West Nile virus," Chapman said. To date in 2011, 88 human cases of WNV from 18 California counties have been reported. Last year 111 cases and six fatalities were reported.

WNV is most commonly transmitted to humans and animals through a mosquito bite. The risk of serious illness to most people is low. However, some individuals - less than 1 percent - will develop serious neurologic illness such as encephalitis or meningitis. Individuals 50 years of age and older have a higher chance of getting sick and are more likely to develop serious symptoms. Studies also show that those with diabetes and/or hypertension are at greatest risk for serious illness.

Chapman said that the most effective way for individuals to prevent exposure to mosquito bites and West Nile virus is to remember the "Four D's":

1. DEET - Apply insect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR3535 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.

2. DRESS - Wear clothing that reduces the risk of skin exposure to mosquito bites.

3. 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.

4. 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 (available from your local mosquito and vector control agency) or commercially available products to eliminate mosquito larvae.

California's West Nile virus website includes the latest information on West Nile virus activity in the state. 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).

www.cdph.ca.gov

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

As of Aug 20, 2014201420135Y AVG
Counties363932
Human cases935933
Dead birds1480834508
Mosquito samples20411349994
Sentinel chickens129176107
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2013 YTD activity -

WNV Reports

Weekly Report

08.20 2014 YTD WNV Activity Map
08.19 2014 US Arboviral Activity Update
08.15 Arbovirus Bulletin #26

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08.18 2014 Human WNV Incidence Report
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08.12 2013 Human WNV Incidence Report

Dead Birds

08.20Reported, Tested, Positive 2014
08.20Positive Counts by City/County for 2014
08.20Positive Species for 2014

Mosquitoes

08.15 AMOR - EVS Week 32
08.15 AMOR - GRAVID Week 32
08.15 AMOR - NJLT Week 32

Horses

12.16 2010 Equine WNV Result Map
12.16 2010 Confirmed Equine Cases Report
05.26 2009 Equine WNV Result Map
- view report archives -