2015 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, and 2014.

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

West Nile virus positives total for 2015
Sentinel Animals000
Mosquito Samples134
Dead Birds639

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)
06/11/2015YoloWoodland95776Cx pipiens (45)
06/16/2015YoloDavis95618Cx pipiens (1)
06/23/2015YoloDavis95616Cx pipiens (7)
06/23/2015SacramentoElk Grove95758Cx pipiens (34)

Dead birds tested positive for West Nile virus:
CollectedCountyCityZip CodeSpecies
06/08/2015SacramentoIsleton95641American crow #15-994
06/11/2015YoloDavis95616American crow #15-1072
06/11/2015YoloDavis95616American crow #15-1077
06/11/2015SacramentoSacramento95820American robin #15-1087
06/17/2015SacramentoSacramento95831American crow #15-1189
06/18/2015YoloDavis95618Western Scrub-Jay #15-1203
06/22/2015SacramentoSacramento95842American crow #15-1252
06/22/2015SacramentoSacramento95842American crow #15-1253
06/22/2015SacramentoSacramento95662Yellow-billed magpie #15-1277

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.