Virus neutralization capacity six months after second vaccination, as determined by surrogate assays and full virus NT. (A) Correlation of NeutraLISA (Lübeck, Germany) with full virus NT six months after second vaccination; linear regression of the data and 95% confidence interval indicated by solid and dashed lines, respectively (r2 = 0.79, p < 0.001); insert: blow ups of low-level range. (B) Correlation of cPass with full virus NT six months after second vaccination; linear regression of the data and 95% confidence interval indicated by solid and dashed lines, respectively (r2 = 0.77, p < 0.001); insert: blow up of low-level range. For numbers of included participants, see Supplementary Table S1.