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(A) SARS-CoV-2 anti-spike IgG antibody concentrations and (B) SARS-CoV-2 neutralizing antibody titers at 28 days following the first dose of ChAdOx1 nCoV-19 according to the absence or presence of reactogenicity. The median and interquartile range are shown. IgG values below the lower limit of quantitation were set to 0.5 times the lower limit of quantitation. AU, arbitrary units.
