On reproductive and respiratory syndrome virus dissemination across pig production systems in the United States

Manuel Jara; David A. Rasmussen; Cesar A. Corzo; Gustavo Machado

To determine the effect of different predictors on the spread of PRRSv, we analyzed the results of the 158 continuous phylogeographic analysis using the R package "seraphim" version 1.0 (Dellicour et al., 2016)., 159 considering a continuous location approach (based on the geographic coordinate location of each pig 160 farm) and a random walk diffusion model. Spatiotemporal information was extracted from 100 trees 161 sampled at regular intervals from the posterior distribution, after burn-in, to account for phylogenetic 162 uncertainty. Each phylogenetic branch was considered a vector defined by its start and end location (e.g. 163 latitude and longitude), and its start and end dates. Statistical significance for the correlation between 164