Therefore, using equation 7, a network-based risk index of one describes a municipality with the highest risk to receive infected animals by animal movements for the considered network.
Additionally, we also calculated a population-based index that standardized the raw index by the swine population reported for the last year of analysis in each municipality. We scaled the animal population size from zero to one, representing the proportion of animals in the municipality. In order to show the swine population at-risk related to the network-based risk index (equation 7), we scaled the index by swine population, following eq 8,