With increasing age, there was a significant trend towards lower levels of anti‐S1‐IgG, but only after the first three vaccinations, and a shorter half‐life of these antibodies after infection.
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SARS-CoV-2 Antibody Levels and Infections in Multiple Vaccinated Employees Over Time.
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The sentences
This is consistent with the highly significant Spearman rank correlations between all pre‐infection samples (Figure 1d ).