Viral isolation was preformed in MDCK cells and hemagglutination inhibition assay was used for subtype identification .

用MDCK细胞进行 病毒分离，用 血 凝抑制试验对分离到的病毒标本进行分型鉴定。

The immune response profile following viral infection was analyzed by hemagglutination inhibition ( HI ) test for both acute and convalescent phase sera of the confirmed cases .

血 凝抑制（HI）实验检测急性期和恢复期血清，评价检测 病毒感染后的免疫应答情况。