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Correlation of Ortho VITROS COVID‐19 antibody test with class‐specific receptor‐binding domain endpoint titers in convalescent plasma units. Linear regression analysis of class‐specific SARS‐CoV‐2 antibody levels compared to the signal to cutoff (S/CO ratio) used to characterize units prior to donation. OV, Ortho VITROS; S/CO, Ortho VITROS signal to cutoff ratio value [Color figure can be viewed at wileyonlinelibrary.com]
