Sorting higher Euroimmun categories indicates virus neutralization to WA-1, δ, and ο. WA-1 (A), δ (B), and ο (C) virus microneutralization measured in CCP, post-δ COVID-19/postvaccination, and hyperimmune globulin (HIG) sorted for viral-specific antibody levels by Euroimmun AU at 1:101 dilution. IU/mL geometric means are shown above x-axis. The ratio of donor plasma neutralizations to total tested is shown below x-axis (neutralization number/total number).The P values were Tukey’s multiple comparisons of 1-way ANOVA. ****P < .0001; ***P < .001; **P < .01; *P < .05.