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(A) Study flow diagram (B) SARS-CoV-2 binding antibody response at post-third mRNA COVID-19 vaccine following the primary heterologous CoronaVac/ChAdOx1 versus ChAdOx1/ChAdOx1 vaccination schedules. Anti-RBD IgG levels ≥ 7.1 BAU/mL (equal to 50 AU/mL) were considered positive, whereas levels >300 BAU/mL were considered as adequate response. a Mann-Whitney test, b Wilcoxon signed rank test.
