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. 2022 Apr 7;96(8):e00177-22. doi: 10.1128/jvi.00177-22

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FIG 2 — Serum levels of antiviral antibodies wane over time after the second vaccine dose. (A and B) Fluctuations over time of specific antibody serum levels (shown as optical densities) elicited by CoronaVac (A) and AstraZeneca (B) vaccines were subjected to a correlation analysis. Significant tendencies of serum level decreases of specific antibodies over the time after the second dose (0 to 3, 4 to 6, 7 to 9, and 10 to 12 months) were observed (P ≤ 0.05; r < 0). The y axis shows absorbance as optical density (OD) values. The x axis shows the time after last dose in which the sample was obtained. Both r and P values are shown in the figure.