Figure 5.

Anti-spike IgG by standardized ELISA in participants who were vaccinated and then had a positive PCR test. Data shown are ELISA values at timepoints after a positive PCR test, in participants who received two doses of vaccine prior to a positive PCR test. Each dot represents one sample. The solid line is the regression curve from a linear mixed model of log-transformed ELISA values regressed on log-transformed days since PCR test, with a participant-level random effect. Dotted curves show the bootstrapped predicted 95% confidence limits. Dotted horizontal line shows lower limit of the assay (EU=1)