Amino acid changes in HA1 of the H5N1 viruses isolated from humans

a“+”, indicates positive binding; “−“, indicates negative binding in HI and/or MN assays.
bAmino acid numbering is based on H5 HA.

a "+" 表示在血凝抑制试验（Hemagglutination Inhibition, HI）和/或微量中和试验（Microneutralization, MN）中呈阳性结合；"−" 则表示呈阴性结合。
b 氨基酸编号以H5亚型血凝素（Hemagglutinin, HA）为基准。