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

Case Counts by County

CountyDead birds
Alameda10
Alpine-
Amador-
Butte1
Calaveras-
Colusa-
Contra Costa3
Del Norte-
El Dorado2
Fresno-
Glenn-
Humboldt1
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles4
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange1
Placer19
Plumas-
Riverside3
Sacramento181
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin7
San Luis Obispo-
San Mateo2
Santa Barbara-
Santa Clara26
Santa Cruz2
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus1
Sutter3
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo19
Yuba-
Total285

WNV Activity by County
Printable Version
2018 | 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 Aug 10, 2018201820175Y AVG
Counties333136
Human cases192232
Dead birds285172657
Mosquito samples94218051679
Sentinel chickens3858113
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2018 YTD activity -

WNV Reports

Weekly Report

08.13 2018 YTD SLEV Activity Map
08.13 2018 YTD WNV Activity Map
08.10 Arbovirus Bulletin #19

Humans

08.09 2018 Human WNV Incidence Report
08.09 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

08.10Reported, Tested, Positive 2018
08.10Positive Species for 2018
08.10Positive Counts by City/County for 2018

Mosquitoes

08.10 AMOR - EVS Week 31
08.10 AMOR - GRAVID Week 31
08.10 AMOR - NJLT Week 31
- view report archives -