Figure S1 Phylogenetic analysis of the PB2 (A), PB1 (B), PA (C) and NP (D) of the 14 IAVs-S. The unrooted trees were based on nucleotides sequences of PB2, PB1, PA and NP and were generated with the MEGA 7.0 program by using neighbor-joining analysis and reliability of the tree was assessed by bootstrap analysis with 1000 replications. Neighbor-joining bootstrap values ≥70 are shown at the major branches of the trees