Table 1.
Bold letter of amino acid indicates a change in comparison to other strains of same clade.
Dk, duck; Ck, chicken; BHG, black headed gull; HK, Hong Kong; Mdk, muscovy duck; VN, Vietnam; sw, swallow; MalDk, mallard duck; KR, South Korea; KH, Cambodia; Gs, goose.
a)Viruses from our own study.
b)Prototype reference strains for clade 2.3.2.1a/b/c.