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. 2021 Feb 22:fdab011. doi: 10.1093/pubmed/fdab011

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© The Author(s) 2021. Published by Oxford University Press on behalf of Faculty of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

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Fig. 2 — Effect of DBS storage duration on the measurement of (A) RBD- and (B) S1- specific IgG response for all DBS specimens (blue) and their corresponding serum samples (red) based on DBS storage time (n = 95) Paired t-test and Pearson’s correlation analysis were performed for IgG concentrations and correlation analysis, respectively. The dotted line represents the cut-off for seropositivity based on pre-pandemic sera plus two standard deviations.