Fig. 1

Phylogenetic trees of HA (positions 1–1701), NA (positions 1–1410), PB2 (positions 1–2280), PB1 (positions 1–2274), PA (positions 1–2151), NP (positions 1–1497), M (positions 1–982), and NS (positions 1–838) segments from the novel reassortant H6N1 avian influenza viruses, ZJ-1664 and ZJ-1667. The tree was created by the maximum likelihood method and bootstrapped with 1000 replicates using the MEGA6 software version 6.0. The H6N1 viruses characterized are indicated by a triangle in red, and the H6N1 influenza virus responsible for human infection in 2013 is indicated by a dot in red. The scale bar represents the distance unit between sequence pairs