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Violin plot of pre‐D3 versus 1 month post‐D3 antibody level, categorized by assay. Reference line delineates positive cut‐offs for anti‐RBD (≥0.8 U/ml) and anti‐S1 (≥1.1 AU). Anti‐RBD assay is measured along a log10 scale on the y‐axis. (A) Roche EIA; (B) EUROIMMUN EIA
