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This West Nile virus sample risk map is derived from NASA satellite data and disease control data from the Center for Disease Control and state health departments. The colors represent relative levels of risk for West Nile Virus in 2001 as follows:
- grey – no data
- green – no risk
- yellow – low risk
- orange – medium risk
- red – high risk
Black circles indicate the location of infected crows.
Courtesy NASA 
For additonal commentary on this map, see .
For an animated range map showing the spread of the West Nile Virus from 1999 – 2002, see http://environmentalrisk.cornell.edu/WNV/Summary.php
This work is believed to be Public Domain, as INTREPID falls under the umbrella of NASA’s Public Health Applications Program.