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

Case Counts by County

CountyDead birds
Alameda5
Alpine-
Amador-
Butte3
Calaveras-
Colusa-
Contra Costa5
Del Norte-
El Dorado-
Fresno3
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings3
Lake3
Lassen-
Los Angeles50
Madera2
Marin2
Mariposa-
Mendocino-
Merced3
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange19
Placer11
Plumas-
Riverside4
Sacramento293
San Benito-
San Bernardino-
San Diego175
San Francisco-
San Joaquin20
San Luis Obispo-
San Mateo9
Santa Barbara-
Santa Clara48
Santa Cruz1
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus6
Sutter6
Tehama-
Trinity-
Tulare1
Tuolumne-
Ventura11
Yolo30
Yuba1
Total715

WNV Activity by County
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2010 | 2009 | 2008
2007

Press Releases

West Nile Virus at Highest Level Ever in Mosquitoes

Sep 3, 2014

FOR IMMEDIATE RELEASE
PH14-078
CONTACT: Anita Gore
(916) 440-7259

Significant increase in human cases


SACRAMENTO - Dr. Ron Chapman, director of the California Department of Public Health (CDPH) and state health officer, is reminding Californians to remain vigilant against the threat of West Nile virus.

"The proportion of mosquitoes infected with West Nile virus is at the highest level ever detected in California," Chapman said. "Last week, 52 new human cases were reported to CDPH. We expect to see more people become infected as this is the time of year when the risk of infection is the highest."

So far in 2014, West Nile virus has been detected in 36 California counties. There have been 181 human cases reported to CDPH, a significant increase compared to the 101 cases reported by this time last year. Eight confirmed deaths have been reported to CDPH.

West Nile virus is transmitted to humans and animals by the bite of an infected mosquito. For most people, the risk of serious illness is low. However, some individuals - less than one percent - can develop a serious neurologic illness, such as encephalitis or meningitis. People 50 years of age or older and people with diabetes and/or high blood pressure have the greatest risk of developing serious complications.

CDPH recommends that individuals prevent exposure to mosquito bites and West Nile virus by practicing the "Three Ds:"

  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. DAWN AND DUSK - Mosquitoes bite in the early morning and evening so it is important to wear protective clothing and repellent if outside during these times. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.

  3. DRAIN - Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flower pots, old car tires, and buckets. If you know of a swimming pool that is not being properly maintained, please contact your local mosquito and vector control agency.

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 on the website or by calling toll-free 1-877-WNV-BIRD (968-2473).

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

As of Jul 29, 2016201620155Y AVG
Counties343630
Human cases3108
Dead birds715303417
Mosquito samples14871058766
Sentinel chickens734542
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

07.29 Arbovirus Bulletin #21
07.29 2016 YTD WNV Activity Map
07.22 Arbovirus Bulletin #20

Humans

03.21 2015 Human WNV Incidence Report
03.21 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

07.29Positive Species for 2016
07.29Reported, Tested, Positive 2016
07.29Positive Counts by City/County for 2016

Mosquitoes

07.29 AMOR - EVS Week 29
07.29 AMOR - GRAVID Week 29
07.29 AMOR - NJLT Week 29
- view report archives -