Quantitative SARS-CoV-2 Spike Receptor-Binding Domain and Neutralizing Antibody Titers in Previously Infected Persons, United States, January 2021-February 2022.

Violin plots of binding antibody titers showed an increasing trend in mean titer over the 4 variant epochs for all age groups: <18 years, β = 0.15 (95% CI 0.13–0.17); 18–49 years, β = 0.29 (95% CI 0.27–0.32); 50–64 years, β = 0.30 (95% CI 0.28–0.33); and > 65 years, β = 0.29 (95% CI 0.27–0.32) ( Figure 5 , panel A).

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