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

Case Counts by County

CountyDead birds
Alameda11
Alpine-
Amador-
Butte21
Calaveras-
Colusa-
Contra Costa26
Del Norte-
El Dorado4
Fresno6
Glenn4
Humboldt-
Imperial-
Inyo-
Kern-
Kings4
Lake4
Lassen-
Los Angeles113
Madera5
Marin5
Mariposa-
Mendocino-
Merced5
Modoc-
Mono-
Monterey-
Napa1
Nevada2
Orange78
Placer28
Plumas-
Riverside14
Sacramento408
San Benito-
San Bernardino5
San Diego254
San Francisco-
San Joaquin35
San Luis Obispo-
San Mateo11
Santa Barbara-
Santa Clara85
Santa Cruz2
Shasta3
Sierra-
Siskiyou-
Solano11
Sonoma8
Stanislaus12
Sutter10
Tehama-
Trinity-
Tulare3
Tuolumne-
Ventura30
Yolo71
Yuba4
Total1283

WNV Activity by County
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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 Sep 28, 2016201620155Y AVG
Counties374038
Human cases234233192
Dead birds128310161237
Mosquito samples324927692451
Sentinel chickens296314325
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

09.28 2016 YTD WNV Activity Map
09.23 Arbovirus Bulletin #29
09.20 2016 US Arboviral Activity Update

Humans

09.14 2016 Human WNV Incidence Report
09.14 2003-2016 WNV Case Summary
03.21 2015 Human WNV Incidence Report

Dead Birds

09.28Positive Species for 2016
09.28Reported, Tested, Positive 2016
09.28Positive Counts by City/County for 2016

Mosquitoes

09.23 AMOR - EVS Week 37
09.23 AMOR - GRAVID Week 37
09.23 AMOR - NJLT Week 37
- view report archives -