Log-adjusted population density (people per km2) and US counties with higher than expected WNV human incidence. On the top is a map of the continental United States with log-adjusted population density (people per km2). On the bottom is a map that displays the counties of the US with regards to how many years each county had higher than expected rates of human WNV incidence.
Sugumaran et al. International Journal of Health Geographics 2009 8:43 doi:10.1186/1476-072X-8-43