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The recurrent circulation of highly pathogenic avian influenza (HPAI) H5N1 in Indian poultry since 2006 resulted in emergence of the viruses of distinct antigenic clades of haemagglutinin (HA) with the majority of the H5N1 outbreaks since 2011 belonging to clade 2.3.2.1. The present study was aimed to characterize the antigenic profile of a collection of H5N1 HPAI viruses of clade 2.3.2.1 isolated...