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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Clin Immunol. 2013 Mar 15;147(2):79–88. doi: 10.1016/j.clim.2013.02.022

Figure 1. The increase in serum levels of influenza virus-specific IgG is lower in elderly people compared to young people after influenza vaccination.

Figure 1

(A–B) Serum levels of IgG specific for individual strains of influenza virus included in influenza vaccine 2011–2012 (A/California/7/2009 (H1N1), A/Perth/16/2009 (H3N2) and B/Brisbane/60/2008) were measured in young (n = 29) and elderly (n = 26) adults by ELISA before and ~32 days (range, 29–36 days) after influenza vaccination. (A) IgG levels in pre- and post-vaccination sera were compared in young and elderly people. (B) Ratios of pre- and post-vaccination IgG levels were compared between young and elderly people. P values were obtained by paired (A) or unpaired (B) t-test.