Case Counts by County

CountyDead birds
Alameda96
Alpine-
Amador-
Butte22
Calaveras-
Colusa4
Contra Costa44
Del Norte-
El Dorado7
Fresno9
Glenn4
Humboldt2
Imperial-
Inyo-
Kern3
Kings3
Lake18
Lassen-
Los Angeles99
Madera5
Marin6
Mariposa-
Mendocino-
Merced8
Modoc-
Mono-
Monterey-
Napa12
Nevada-
Orange431
Placer40
Plumas-
Riverside1
Sacramento294
San Benito-
San Bernardino17
San Diego35
San Francisco-
San Joaquin53
San Luis Obispo-
San Mateo20
Santa Barbara2
Santa Clara925
Santa Cruz1
Shasta6
Sierra-
Siskiyou-
Solano33
Sonoma37
Stanislaus47
Sutter19
Tehama-
Trinity-
Tulare40
Tuolumne-
Ventura7
Yolo71
Yuba16
Total2437

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

Resources

West Nile Virus Information for Physicians

Aug 3, 2012

West Nile virus (WNV) has been detected in many regions of the state. Physicians should:


  • Be aware if WNV is active in their area
  • Look for symptoms of WNV
  • Test for WNV because testing:

    • differentiates WNV from other conditions (enterovirus, other arboviral diseases) and thus may prompt a change in treatment regime
    • results offer anticipatory guidance--both WNV neuroinvasive disease and WN fever patients can have lingering symptoms and knowing the underlying etiology is helpful for the patient and family members
    • helps mosquito control and public health agencies institute proper control measures to reduce the risk of further cases in the event of a positive result

  • Contact their local public health department for details on sample submission and testing


For additional information, please see these resources:

Locate Your Local Mosquito and Vector Control Agency
Search by Zip Code

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

As of Dec 16, 2014201420135Y AVG
Counties404440
Human cases794375241
Dead birds24371251901
Mosquito samples334025281966
Sentinel chickens443485428
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2013 YTD activity -

WNV Reports

Weekly Report

12.16 2014 US Arboviral Activity Update
12.16 2014 YTD WNV Activity Map
12.12 Arbovirus Bulletin #42

Humans

12.16 2014 Human WNV Incidence Report
12.16 2003-2014 WNV Case Summary
08.12 2013 Human WNV Incidence Report

Dead Birds

12.16Reported, Tested, Positive 2014
12.16Positive Counts by City/County for 2014
12.16Positive Species for 2014

Mosquitoes

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