Fig. 30From: Diversity and distribution of type A influenza viruses: an updated panorama analysis based on protein sequencesPhylogenetic diversity and distribution of IAVs based on NP gene sequences. Based on the viral NP gene sequences, IAVs were classified into four primary lineages, NP.1, NP.2 and NP.3 which mainly corresponded to AIVs, HuIVs and SIVsBack to article page