Table 3.

Associations between human WNV disease incidence and land cover at the regional extent

Land cover	Positive	Negative
Developed, open space	Mid-South, Great Lakes, New England, Mid-Atlantic	Upper Plains, Northwest
Developed, low intensity	Mid-South, Great Lakes, New England, Mid-Atlantic	Upper Plains, Northwest, South Central
Developed, medium intensity	Mid-South, Great Lakes, New England, Mid-Atlantic	Upper Plains, Northwest
Developed, high intensity	Mid-South, Great Lakes, New England, Mid-Atlantic, South Central	Upper Plains, Northwest
Barren land	Mid-Atlantic	Deep South, Great Lakes, Southwest
Deciduous forest	None	Upper Plains, Deep South, Mid-South, Great Lakes, Mid-Atlantic, Northwest, South Central
Evergreen forest	None	Upper Plains, Deep South, Mid-South, Great Lakes, New England, Northwest, South Central, Southwest
Mixed forest	None	Upper Plains, Mid-South, Great Lakes, New England, Northwest, South Central, Southwest
Shrub	Deep South	Mid-South, Great Lakes, New England, Southwest
Grassland	Upper Plains, Northwest, South-Central, Southwest	Deep South, Great Lakes, Mid-Atlantic
Pasture	None	Upper Plains, South Central
Crops	Deep South, Mid-South, Great Lakes, Mid-Atlantic, Northwest, South Central, Southwest	Upper Plains
Woody wetland	Deep South, Mid-Atlantic	Upper Plains, Great Lakes, South Central
Herbaceous wetland	Mid-Atlantic, Southwest	Great Lakes

Regions are listed by significant positive or negative associations with specific land cover types.