Fig. 25From: Diversity and distribution of type A influenza viruses: an updated panorama analysis based on protein sequencesPhylogenetic diversity and distribution of N8 subtype IAVs based on NA sequences. N8 subtype IAVs were classified into three primary lineages. N8.1 corresponded to AIVs circulating in the Western Hemisphere; N8.2 corresponded to AIVs circulating in the Eastern Hemisphere; N8.3 corresponded to EIVsBack to article page