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Live SARS-CoV-2 serum dilution titres were determined against B.1.617.2-delta and B.1.1.529-omicron in serum samples from individuals with breakthrough infection determined using focus reduction neutralization test 50 values (FRNT50). Number indicates the geometric mean titres with 95% CIs. Statistics were calculated using Wilcoxon matched pair signed rank test. *** p < 0.001.
