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Distribution of IgA, IgG and neutralizing antibody titres to SARS‐CoV‐2 by ABO blood group in eligible convalescent plasma donors. Box‐and‐whisker plots were used to depict the median (thick horizontal line), interquartile ranges and upper/lower extreme limits. The red diamond depicts the arithmetic mean. Circles depict the individual data points. P values were determined from non‐parametric Kruskal–Wallis tests.
