Figure 1
From: Poultry farms as a source of avian influenza A (H7N9) virus reassortment and human infection
Phylogenetic tree of the PA gene.
The branches in orange represent the H7N9 viruses and those in black represent the H9N2 viruses. The branches in red represent the H7N9 and H9N2 viruses isolated in this study. The names of the viruses are labeled in the adjacent square frames. The red branches represent the H7N9 viruses and those in blue represent H9N2 viruses.
