Below is a map of confirmed positive samples of West Nile virus activity in Sacramento and Yolo counties to date this calendar year. For a list view of this data, please see the West Nile Virus Activity page.

Blue Pins – WNV Positive Bird Pick-Up Locations
Green Pins – WNV Positive Mosquito Samples
Locations are randomized within a 500 foot radius.

 
 
 
The maps and data shown below is from the California Vectorborne Disease Surveillance System (CalSurv), a cooperative effort with UC Davis Arbovirus Research and Training Laboratory, the California Department of Public Health the Mosquito and Vector Control Association of California, and the Sacramento-Yolo Mosquito & Vector Control District.