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Fig. 2 | Immunity & Ageing

Fig. 2

From: Interseason waning of vaccine-induced hemagglutination inhibition antibody titers and contributing factors to pre-existing humoral immunity against influenza in community-dwelling older adults 75 years and older

Fig. 2

Relationships between current season pre-vaccination HAI antibody titers and interseason antibody decline (waning). Associations of current season pre-vaccination HAI antibody titers measured using prior season vaccine strain antigens with interseason antibody decline (waning) as indicated by the ratios shown in Table 2 were evaluated in univariate analyses. A IAV-H3N2: Spearman correlation coefficient between 2014–2015 (n = 49) was 0.30 (p = .04) and that between 2015–2016 (n = 52) was 0.23 (p = .10); B IBV: Spearman correlation coefficient between 2014–2015 (n = 49) was 0.49 (p < .01) and that between 2015–2016 (n = 52) was 0.34, (p = .02); C IAV-H1N1: Spearman correlation coefficient between 2016–2017 (n = 78) was 0.51 (p < .01)

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Immunity & Ageing

ISSN: 1742-4933

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