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Serum antibody levels monitored in groups of pigs and ferrets in interspecies transmission study II to assess seroconversion after infection. A) Influenza A virus nucleoprotein competitive ELISA, showing inverse of competitive inhibition, %. Dotted line indicates lower limit for the positive threshold. B) GMR of hemagglutination–inhibition titer to the A/swine/England/1382/2010 challenge strain. GMR, geometric mean ratio.
