Influenza A Virus (IAV) subtypes, A/England/195/2009 (pH1N1) and the A/HK/1174/99 (H3N2), were obtained as described recently (32 (link), 33 (link)). H1N1 and H3N2 pseudotyped viral particles were produced using the plasmids obtained from Addgene (32 (link), 33 (link)). pcDNA3.1-swineH1-flag (H1 from swine H1N1 A/California/04/09) (Invitrogen), pcDNA3.1-swine N1-flag (N1 from swine H1N1 A/California/04/09), and pcDNA H3 (from A/Denmark/70/03 (H3N2) (Invitrogen) were purchased commercially. Plasmid pI.18-N2 [N2 from A/Texas/50/2012/(H3N2)] was provided by Dr Nigel Temperton (University of Kent). Anti-influenza viral antibodies and recombinant viral proteins were obtained from BEI Resources, National Institutes of Health, USA (32 (link), 33 (link)).
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