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-
Butte22
Calaveras-
Colusa-
Contra Costa33
Del Norte-
El Dorado4
Fresno6
Glenn4
Humboldt-
Imperial-
Inyo-
Kern-
Kings4
Lake5
Lassen-
Los Angeles124
Madera5
Marin5
Mariposa-
Mendocino-
Merced5
Modoc-
Mono-
Monterey-
Napa1
Nevada2
Orange91
Placer30
Plumas-
Riverside16
Sacramento411
San Benito-
San Bernardino5
San Diego264
San Francisco-
San Joaquin37
San Luis Obispo-
San Mateo15
Santa Barbara-
Santa Clara89
Santa Cruz2
Shasta3
Sierra-
Siskiyou-
Solano13
Sonoma8
Stanislaus14
Sutter10
Tehama-
Trinity-
Tulare3
Tuolumne-
Ventura34
Yolo72
Yuba4
Total1352

WNV Activity by County
Printable Version
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 Jan 02, 2017201620155Y AVG
Counties394133
Human cases442782487
Dead birds135213491337
Mosquito samples352833292409
Sentinel chickens343449383
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

03.08 2016 YTD WNV Activity Map
01.17 2016 US Arboviral Activity Update
12.16 Arbovirus Bulletin #40

Humans

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

Dead Birds

03.08Positive Species for 2016
03.08Reported, Tested, Positive 2016
03.08Positive Counts by City/County for 2016

Mosquitoes

11.10 AMOR - EVS Week 44
11.10 AMOR - GRAVID Week 44
11.10 AMOR - NJLT Week 44
- view report archives -