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. 2022 Feb 25;14(3):470. doi: 10.3390/v14030470

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Recent strain antibody titers of groups with documented prior exposure to A(H3N2) compared to a reference group with no recent exposure. Ha Nam Cohort participants who lacked recent A(H3N2) exposure were assigned as the reference group. Pre-vaccination titers against A(H3N2) viruses are shown for each prior exposure group in (A), and are presented as ratios compared to the reference group in (B). Post vaccination and Post season ratios to reference group are presented in (C) and (D). Numbers per group are given in Table 3. Results are presented as geometric mean titers (A) or as estimated mean ratios to reference (B–D) with 95% confidence intervals. The red shaded panel indicates the current vaccine strain.