Fig. 2
From: Epidemic of wild-origin H1NX avian influenza viruses in Anhui, China
Phylogenetic analysis of the inner genes of H1 subtype AIVs isolated from 2014–2015 by maximum likelihood. The colours of the virus names in the PB2(a), PB1(b), PA(c), NP(d), M(e), and NS(2f) trees match those used in the genotype table. The phylogenetic trees of inner genes were rooted to A/Spanish/1/1918 (H1N1). The sequences of viruses listed in black were downloaded from GenBank; viruses listed in red, yellow, and green were sequenced in this study. Abbreviations: CK, chicken; DK, duck; GS, goose; SW, swine; WDK, wild duck; EN, environment