2016 West Nile Virus Activity

The Sacramento-Yolo Mosquito and Vector Control District's ongoing surveillance program has detected West Nile virus activity in Sacramento or Yolo counties. Archived data is available for 2007 activity, 2008, 2009, 2010, 2011, 2012, 2013, 2014, and 2015.

For Human and Equine cases, please visit westnile.ca.gov.

West Nile virus positives total for 2016
Sentinel Animals000
Mosquito Samples000
Dead Birds303

Click here for a map of these locations

Below you will find the breakdown of West Nile virus activity

Sentinel animals tested positive for West Nile virus:
TestedCountyCityZip Code

Mosquito Samples tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies (# of Mosquitoes in Trap)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
05/10/2016SacramentoSacramento95864American Crow #16-386
05/19/2016SacramentoSacramento95826Yellow-billed Magpie #16-517
05/23/2016SacramentoSacramento95864American Crow #16-551

If you see a bird, particularly a crow or magpie, lacking signs of trauma that has been dead for less than 24 hours, please call 1-877-WNV-BIRD (1-877-968-2473) or report it online here. Crows and magpies are particularly susceptible to the disease, so they make excellent early warning sentinels for virus activity in our area.