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

Supplementary Table S5 for more details). Our analysis reveals that when comparing PRRSv 255 dissemination between types of farms, the most frequent routes were linked with sow farms, especially 256 when the direction of spread was from sow to nursery (BF > 42). The highest support for this route 257 . CC-BY-NC-ND 4.0 International license author/funder. It is made available under a The copyright holder for this preprint (which was not peer-reviewed) is the . https://doi.org/10.1101/2020.04.09.034181 doi: bioRxiv preprint occurred when we analyzed all systems combined (BF = 109). The second most well-supported 258 dissemination occurred from sow to finisher farms (BF > 17.9), and as in the previous case, was best 259 supported when we analyzed all systems together. (BF = 80.5). Likewise, the dissemination between 260 nursery and finisher farms (in both directions) also showed positive support (BF > 6). However, all routes 261 of dissemination that involved boar stud farms were rare events (BF < 3) (Table 2) . Furthermore, the 262 sensitivity analysis showed similar trends, where the results of the equal sample sizes these were less 263