Frequency distribution of N119, D125, E187, G222, and R223 variants within the HA receptor binding site of viruses obtained from clinical specimens infected with influenza A viruses.

Frequency distribution of N119, D125, E187, G222, and R223 variants within the HA receptor binding site of viruses obtained from clinical specimens infected with influenza A viruses.从感染甲型流感病毒的临床标本中分离得到的病毒，其血凝素（Hemagglutinin, HA）受体结合位点内N119、D125、E187、G222及R223变异株的频率分布。