... highly pathogenic avian influenza were retrieved from the database and included in the analysis human, classical swine and Eurasian swine lineages (Fig 1) The avian NP lineage contains all avian influenza ... (PB1), avian lineage (PB2, PA), Eurasian swine lineage (NA, M) and classical swine lineage (HA, NP, NS) [14,15] This serves as an example that certain influenza A strains can harbor an NP gene that ... divided into distinct lineages, Eurasian swine lineage and classical swine lineage Based on topology of the phylogenetic tree, the Eurasian swine lineage is closely related to the avian lineage and...