Adjusted incidence rate ratios (IRR) for the independent associations between human WNV and the landscape variables.

The full model is derived from multiple Poisson regression, with county and year as the panel levels. The associations between WNV occurrence and the independent variables are adjusted for the other variables in the model.1Precipitation is the total monthly precipitation accumulation in centimeters from May through October.2Temperature is the monthly-weighted seasonal cumulative temperature in degrees Celsius.