Effect of variations at four HAs on reactivity with monoclonal antibodies.

Note.1 The monoclonal antibodies(5D5,4D7,4E1,2B3,3G12,1C9,4B12,2C5,2H7,5F7) were specific against HA of pH1N1/WT. HI tests were performed by standard methods using chicken red blood cells. (NT), microneutralization assay.