Case Counts by County

CountyDead birds
Alameda92
Alpine-
Amador-
Butte22
Calaveras-
Colusa4
Contra Costa44
Del Norte-
El Dorado5
Fresno9
Glenn4
Humboldt2
Imperial-
Inyo-
Kern3
Kings3
Lake18
Lassen-
Los Angeles97
Madera5
Marin6
Mariposa-
Mendocino-
Merced8
Modoc-
Mono-
Monterey-
Napa12
Nevada-
Orange386
Placer40
Plumas-
Riverside1
Sacramento293
San Benito-
San Bernardino17
San Diego23
San Francisco-
San Joaquin53
San Luis Obispo-
San Mateo18
Santa Barbara1
Santa Clara897
Santa Cruz1
Shasta6
Sierra-
Siskiyou-
Solano33
Sonoma37
Stanislaus47
Sutter19
Tehama-
Trinity-
Tulare40
Tuolumne-
Ventura7
Yolo71
Yuba16
Total2340

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 Oct 17, 2014201420135Y AVG
Counties404139
Human cases562272173
Dead birds23401198866
Mosquito samples326824891924
Sentinel chickens412463394
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2013 YTD activity -

WNV Reports

Weekly Report

10.17 Arbovirus Bulletin #35
10.17 2014 YTD WNV Activity Map
10.10 Arbovirus Bulletin #34

Humans

10.13 2014 Human WNV Incidence Report
10.13 2003-2014 WNV Case Summary
08.12 2013 Human WNV Incidence Report

Dead Birds

10.17Reported, Tested, Positive 2014
10.17Positive Counts by City/County for 2014
10.17Positive Species for 2014

Mosquitoes

10.17 AMOR - EVS Week 41
10.17 AMOR - GRAVID Week 41
10.17 AMOR - NJLT Week 41
- view report archives -