Surveillance Maps

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

  • Tick Reports 2020
  • WNV Human Cases 2020
  • Mosquito Traps Positive for WNV 2020
  • Bird Death Reports 2020

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 2020

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WNV Human Cases 2020


Mosquito Traps Positive (in red) for WNV 2020


Bird Death Reports 2020