Case Counts by County

CountyDead birds
Alameda19
Alpine-
Amador-
Butte38
Calaveras-
Colusa3
Contra Costa11
Del Norte-
El Dorado4
Fresno3
Glenn4
Humboldt2
Imperial-
Inyo-
Kern1
Kings3
Lake5
Lassen-
Los Angeles103
Madera1
Marin3
Mariposa-
Mendocino-
Merced3
Modoc-
Mono-
Monterey-
Napa7
Nevada10
Orange83
Placer21
Plumas-
Riverside82
Sacramento103
San Benito-
San Bernardino25
San Diego355
San Francisco-
San Joaquin18
San Luis Obispo-
San Mateo23
Santa Barbara3
Santa Clara231
Santa Cruz-
Shasta16
Sierra-
Siskiyou-
Solano10
Sonoma11
Stanislaus14
Sutter16
Tehama-
Trinity2
Tulare23
Tuolumne-
Ventura26
Yolo61
Yuba6
Total1349

WNV Activity by County
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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 Dec 30, 2015201520145Y AVG
Counties414041
Human cases737801509
Dead birds134924421474
Mosquito samples332933402827
Sentinel chickens449443462
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

01.12 2015 US Arboviral Activity Update
01.12 2015 YTD WNV Activity Map
12.18 Arbovirus Bulletin #41

Humans

01.06 2015 Human WNV Incidence Report
01.06 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

01.12Positive Species for 2015
01.12Positive Counts by City/County for 2015
01.12Reported, Tested, Positive 2015

Mosquitoes

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