Case Counts by County

CountyDead birds
Alameda5
Alpine-
Amador-
Butte17
Calaveras-
Colusa3
Contra Costa2
Del Norte-
El Dorado1
Fresno-
Glenn3
Humboldt2
Imperial-
Inyo-
Kern1
Kings1
Lake2
Lassen-
Los Angeles3
Madera1
Marin1
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey-
Napa-
Nevada1
Orange5
Placer4
Plumas-
Riverside16
Sacramento27
San Benito-
San Bernardino1
San Diego65
San Francisco-
San Joaquin7
San Luis Obispo-
San Mateo7
Santa Barbara-
Santa Clara49
Santa Cruz-
Shasta3
Sierra-
Siskiyou-
Solano4
Sonoma3
Stanislaus8
Sutter10
Tehama-
Trinity1
Tulare18
Tuolumne-
Ventura2
Yolo23
Yuba4
Total301

WNV Activity by County
Printable Version
2015 | 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 Jul 31, 2015201520145Y AVG
Counties363527
Human cases8187
Dead birds301875386
Mosquito samples1058977641
Sentinel chickens453938
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2014 YTD activity -

WNV Reports

Weekly Report

07.31 Arbovirus Bulletin #22
07.31 2015 YTD WNV Activity Map
07.28 2015 US Arboviral Activity Update

Humans

07.29 2015 Human WNV Incidence Report
07.29 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

07.31Positive Species for 2015
07.31Positive Counts by City/County for 2015
07.31Reported, Tested, Positive 2015

Mosquitoes

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