Figure 1

Anti-S RBD levels between the investigated vaccination groups at different time points after basic immunization and booster vaccination. Data are presented in the standard box plot format: The box ranges from the first quartile (Q1) to the third quartile (Q3) of the distribution and the range represents the interquartile range (IQR). The median is represented by a line across the box, the mean is depicted by a "+" in the box. Whiskers range from Q1 and Q3 to 1.5 times IQR. Data beyond the whiskers are shown as outliers. Only vaccination cohorts with a median anti-S RBD concentration below the upper limit of quantification (ULoQ) were considered for statistical analysis using the Wilcoxon test.