10.1371/journal.pone.0233605.g002 Yanyu Zhang Yanyu Zhang Kathy Leung Kathy Leung Ranawaka A. P. M. Perera Ranawaka A. P. M. Perera Cheuk-Kwong Lee Cheuk-Kwong Lee J. S. Malik Peiris J. S. Malik Peiris Joseph T. Wu Joseph T. Wu Comparison of antibody titers in 609 matched serum/EDTA-plasma specimens. Public Library of Science 2020 influenza serology surveillance plasma specimen Intraclass Correlation Coefficient risk assessment blood donation archives Hong Kong Red Cross Transfusion Services blood donation services CI hemagglutination inhibition assay serum antibody titers EDTA hemagglutination inhibition titers 2011 influenza seasons 2020-05-29 18:18:11 Figure https://plos.figshare.com/articles/figure/Comparison_of_antibody_titers_in_609_matched_serum_EDTA-plasma_specimens_/12396803 <p>Serum and EDTA-plasma specimens were collected from the same donor at the same time during 2009 (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0233605#pone.0233605.g001" target="_blank">Fig 1</a>). Color codes indicate the fold difference in antibody titers between the matched serum/EDTA-plasma specimens: blue, orange and red indicate no, one-fold and two-fold or more difference, respectively. Pink shades indicate p<0.05 in Stuart-Maxwell test (i.e. statistically significant lack of marginal homogeneity between serum and EDTA-plasma titer distributions).</p>