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IgG ratio at 21 days of vaccines administration for both vaccines before and after the second dose administration. Kruskal–Wallis tests shows p value < 0.0001 (indicated with ***) for each comparison with the exception of II dose AZD1222 vs. first dose of BNT162b2. The figure shows as the second dose of AZD1222 results in an IgG ratio similar to the first dose of BNT162b2 (no significance of Kruskal–Wallis test).
