ANTIGENIC VARIATION OF CLADE 2.1 H5N1 VIRUS IS DETERMINED BY A FEW AMINO ACID SUBSTITUTIONS IMMEDIATELY ADJACENT TO THE RECEPTOR BINDING SITE

Antigenic Variation of Clade 2.1 H5N1 Virus Is Determined by a Few Amino Acid Substitutions Immediately Adjacent to the Receptor Binding Site

ABSTRACT Highly pathogenic avian influenza (HPAI) viruses of the H5N1 subtype are genetically highly variable and have diversified into multiple phylogenetic clades over the past decade.Antigenic drift is a well-studied phenomenon for seasonal human influenza viruses, but much less is known about the antigenic evolution of HPAI H5N1 viruses that ci

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