Biphasic Waning of Hemagglutination Inhibition Antibody Titers After Influenza Vaccination in Children.

Xiong, Weijia; Tsang, Tim K; Perera, Ranawaka A P M; Leung, Nancy H L; Fang, Vicky J; Barr, Ian G; Malik Peiris, J S; Cowling, Benjamin J · J Infect Dis · 2022

rct · Level II

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Abstract

We explored the potential for a biphasic pattern in waning of antibody titers after influenza vaccination. We collected blood samples in a randomized controlled trial of influenza vaccination in children and tested them with hemagglutination inhibition assays for influenza A(H3N2) and influenza B/Victoria lineage. Using piecewise log-linear mixed-effects models, we found evidence for a faster initial waning of antibody titers for the first 1-2 years after vaccination and then slower longer-term declines. Children with higher postvaccination titers had faster antibody decay.

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