Swine influenza A virus genotypes of 23 viruses isolated from pigs in Belgium and the Netherlands, November 2019–December 2021 Top Suggested citation for this article : Parys A, Vereecke N, Vandoorn E, Theuns S, Van Reeth K. Surveillance and genomic characterization of influenza A and D viruses in swine, Belgium and the Netherlands, 2019–2021.