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Plaque‐reduction neutralization of influenza H5 viruses with H5 2.3.2.1 monoclonal antibodies (mAbs). (A) Five 2.3.2.1 H5 viruses were incubated with dilutions of the indicated H5 mAbs at a starting concentration of 80 μg/mL prior to plaque assay with the indicated virus. (B) Amino acid sequences of the five 2.3.2.1 hemagglutinins in the antigenic region encompassing antigenic sites Sa and Sb. Amino acid differences compared with A/duck/Bangladesh/19097/2013 are shown in green.
