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Schematic overview of hemagglutinin (HA) antigens used in the enzyme-linked immunosorbent assay and antibody-dependent cellular cytotoxicity assay. B/Brisbane/60/08 was used as a reference sequence, and mutations relative to B/Brisbane/60/08 in the various antigens are shown in red. The cH8/B antigen contains the globular head of an influenza A virus of the H8 subtype, and the stalk in from B/Yamagata/16/88.
