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Rader plot of average IC50 values (n = 2) of pooled sera from vaccinated mice (n = 8), tested against a panel of six Omicron SARS-CoV-2 pseudoviruses (XBB.1.5, BA.4/5, XBB.1.16, BQ.1.1, BA.2.75.2, and EG.5.1). Sera are collected from mice that were immunized twice with one of five recombinant RBD vaccines adjuvanted with alum + CpG.
