Fig. 1
From: Identifying key bird species and geographical hotspots of avian influenza A (H7N9) virus in China
Phylogenetic tree reconstructed by neighbour joining (NJ) approach based on 184 HA and NA segments of avian influenza A (H7N9) virus. Each leaf is labelled with the name abbreviation of a sequence, where the first two letters stand for the isolated location, and the last two numbers stand for the isolated year. Sequences isolated from the same municipality/provinces are marked with the same colour. Bootstrap values greater than 0.5 are marked at the branches