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Spatial migration network of H9N2 virus geographic dispersal in the China lineage. Arrows represent direction of movement, and the arrow color in HA-China lineage migration network is proportional to starting area. As for NA-China lineage the orange color represents NA-China-II lineage, and the blue color represents NA-China-I lineage. The migration event was starting from Guangdong and Jiangsu Province, and spreading to the other areas in China, Viet Nam, and Japan.
