Surveillance Maps

We provide West Nile virus (WNV) surveillance maps showing the following:

  • Tick Reports 2023
  • WNV Human Cases 2023
  • Mosquito Traps Positive for WNV 2023
  • Bird Death Reports 2023

Reading the Maps

Red circles indicate an area with a positive test for WNV.

Locations may have had more than one positive result on multiple dates. To access all positive historical data, click on the red circle and scroll through.

A human figure symbol indicates an area that has reported a positive human case of WNV.

Tick Reports 2023

View larger map


WNV Human Cases 2023

View larger map


Mosquito Traps Positive (in red) for WNV 2023

View larger map


Bird Death Reports 2023

View larger map