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

Case Counts by County

CountyDead birds
Alameda-
Alpine-
Amador-
Butte-
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado-
Fresno-
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles1
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange1
Placer-
Plumas-
Riverside-
Sacramento4
San Benito-
San Bernardino-
San Diego1
San Francisco-
San Joaquin-
San Luis Obispo-
San Mateo1
Santa Barbara-
Santa Clara-
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus-
Sutter-
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo-
Yuba-
Total8

WNV Activity by County
Printable Version
2017 | 2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007

News

Don't Let The Summer Heat Make You Mosquito Meat!

Jun 8, 2009

Summer is the time when the risk of being bitten by a mosquito carrying West Nile virus (WNV) increases, both outside and inside the home.

Mosquitoes that carry WNV are most active at dawn and dusk, and into the early evening hours. Keep mosquito repellent handy so that each family member remembers to apply it before venturing outside at these times. Use EPA-registered mosquito repellents containing one of the following:

  • DEET
  • Picaridin
  • Oil of lemon eucalyptus
  • IR3535
And don't forget about your protecting yourself and your family inside your home! Make sure each door and window has a screen without rips, tears, or holes. Even a small rip can allow WNV-carrying mosquitoes to enter your home and bite you.

Following these simple suggestions will help you avoid mosquito bites and let you enjoy the wonderful California summer!

Having problems with mosquitoes?

Locate your local mosquito and vector control agency
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Compared to previous year and previous five-year average to date

As of May 26, 2017201720165Y AVG
Counties91110
Human cases100
Dead birds85331
Mosquito samples122720
Sentinel chickens000
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2016 YTD activity -

WNV Reports

Weekly Report

05.26 Arbovirus Bulletin #8
05.26 2017 YTD WNV Activity Map
05.19 Arbovirus Bulletin #7

Humans

02.08 2016 Human WNV Incidence Report
02.08 2003-2016 WNV Case Summary
03.21 2015 Human WNV Incidence Report

Dead Birds

05.26Positive Counts by City/County for 2017
05.26Positive Species for 2017
05.26Reported, Tested, Positive 2017

Mosquitoes

05.26 AMOR - EVS Week 20
05.26 AMOR - GRAVID Week 20
05.26 AMOR - NJLT Week 20
- view report archives -