Extended Data Fig. 9: Correlation plots of anti-spike IgG levels.

a, Correlation between anti-spike IgG levels (BAU/mL) and neutralisation titres in 37 samples. Samples were obtained from the National Institute for Biological Standards and Control (NIBSC, Potters Bar, UK) Anti-SARSCoV-2 Verification Panel for Serology Assays (NIBSC code: 20/B770). b, Correlation between anti-spike IgG levels in mAb45 units (ng/ml) and WHO international units (BAU/mL) in 63 dilution replicates.