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

Case Counts by County

CountyDead birds
Alameda16
Alpine-
Amador-
Butte3
Calaveras-
Colusa-
Contra Costa11
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles9
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange5
Placer40
Plumas-
Riverside5
Sacramento232
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin11
San Luis Obispo-
San Mateo5
Santa Barbara-
Santa Clara43
Santa Cruz2
Shasta4
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter4
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo36
Yuba-
Total430

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 14, 2018201820175Y AVG
Counties373939
Human cases79143188
Dead birds4303371087
Mosquito samples173029792773
Sentinel chickens112204277
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

09.14 Arbovirus Bulletin #24
09.14 2018 YTD SLEV Activity Map
09.14 2018 YTD WNV Activity Map

Humans

09.10 2018 Human WNV Incidence Report
09.05 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

09.14Reported, Tested, Positive 2018
09.14Positive Species for 2018
09.14Positive Counts by City/County for 2018

Mosquitoes

09.14 AMOR - EVS Week 36
09.14 AMOR - GRAVID Week 36
09.14 AMOR - NJLT Week 36
- view report archives -