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-
Fresno4
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles3
Madera-
Marin-
Mariposa-
Mendocino-
Merced1
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange8
Placer-
Plumas-
Riverside-
Sacramento1
San Benito-
San Bernardino-
San Diego1
San Francisco-
San Joaquin3
San Luis Obispo-
San Mateo-
Santa Barbara-
Santa Clara-
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus-
Sutter-
Tehama-
Trinity-
Tulare7
Tuolumne-
Ventura-
Yolo-
Yuba-
Total28

WNV Activity by County
Printable Version
2018 | 2017 | 2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007

Resources

West Nile Virus Information for Physicians

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:

Having problems with mosquitoes?

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

As of Jul 19, 2019201920185Y AVG
Counties172430
Human cases2106
Dead birds28108363
Mosquito samples802315779
Sentinel chickens0723
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2019 YTD activity -

WNV Reports

Weekly Report

07.19 Arbobulletin #16
07.19 2019 YTD SLEV Activity Map
07.19 2019 YTD WNV Activity Map

Humans

07.19 2019 Human WNV Incidence Report
07.19 2003-2019 WNV Case Summary
05.15 2018 Human WNV Incidence Report

Dead Birds

07.19Positive Counts by City/County for 2019
07.19Positive Species for 2019
07.19Reported, Tested, Positive 2019

Mosquitoes

07.19 AMOR - EVS Week 28
07.19 AMOR - GRAVID Week 28
07.19 AMOR - NJLT Week 28
- view report archives -