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. 2019 Apr 17;37(17):2288–2293. doi: 10.1016/j.vaccine.2019.02.078

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Fig. 2 — Serological analysis. Longitudinal serum samples were assessed by hemagglutination inhibition (HI) against (a) the homologous antigen, pH1N1 (A/swine/England/1353/2009), (b) the heterologous antigen, H1_avN1 (A/swine/England/453/2006) and (c) a representative H1_huN2 antigen, A/swine/England/438207/1994. The Geometric Mean Ratio (GMR) for samples relative to the 0dpv sample for each corresponding animal is shown. Virus neutralisation (VN) titres (d) were evaluated for serum samples using the homologous pH1N1 challenge strain A/swine/England/1353/2009.