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Quantification of anti-SARS-CoV-2 RBD antibodies after booster vaccination. Blood samples were collected after the 2-dose CoronaVac regimen (2CoVac) (N = 46) as a baseline before boosting and 4 weeks after boosting with ChAdOx1 (2CoVac + ChAd) (N = 24) or BNT162b2 (2CoVac + BNT) (N = 22). The scatter plots with the median and interquartile range (IQR) of anti-SARS-CoV-2 RBD IgG levels are shown. The Mann–Whitney U test was used for comparison, *** p < 0.001, **** p < 0.0001
