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  • Serum samples from ferrets were tested by hemagglutination inhibition (HI) assay against the reference strains A/California/7/2009 A(H1N1)pdm09, A/Victoria/361/2011 (H3N2), B/Wisconsin/1/2010 (B/Yamagata-lineage) and B/Brisbane/60/2008 (B/Victoria-lineage) to ensure seronegativity against currently circulating influenza subtypes and lineages.
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