Genomic sequence data of viruses can greatly improve our understanding of viral spread within and between populations. These data provide insights into transmission links between humans or animals, which are undetectable by epidemiological data. By integrating genetic, epidemiological and immunological data, we can study the processes shaping phylogenetic trees (Grenfell et al. 2004). This upcoming field, called phylodynamics, has proven useful in understanding outbreaks of, for instance, Covid-19. In PROVED, these models will enhance our knowledge of two viruses in swine. For more info, visit the UU website.