Figure 3

Model-predicted high risk areas (HRAs) for the occurrence of human infections with H7N9 and with H5N1 in mainland China.

HAR-I (red) represents counties with predicted probabilities of occurrence of human infection >50% for both H7N9 and H5N1, above-average densities of swine and poultry and below-average distance from their centroid to one of the nearest important bird areas; HAR-II (lazuli) represents counties with predicted probabilities of occurrence of human infection >50% for both H7N9 and H5N1 but not in HRA-I; HAR-III (rose) represents counties with a predicted probability of occurrence of human H7N9 virus infection >50% but no in HRA-I and HRA-II; HAR-IV (blue) represents counties with a predicted probability of occurrence of human H5N1 virus infection >50% but not in HRA-I and HRA-II. The map was created in ArcGIS 9.3 software (ESRI Inc., Redlands, CA, USA) (http://www.esri.com/).