Fig. 4

The genotypes of the eight H6 subtype AIVs. The eight H6 subtype AIVs were reassortants from 9 subgroups, including ST2853-like, HN573-like, Mongolia-like, W312-like, Bangladesh-like, Japan-like, ST339-like, South China-like and North American-lineage. According to different combinations, the eight viruses were divided into seven genotypes