Figure 3.

Anti‐S IgG levels in healthcare workers vaccinated with Coronavac, according to previous COVID‐19 infection. The quantitative assessment of IgG was measured after 28 days of the first dose (1D), 28 days of the second dose (2D), and 6 months after the second dose with CoronaVac (6mA2D). The groups were divided in positive RT‐PCR and negative RT‐PCR before vaccination. Data were expressed by the concentration AU/ml for median values. The comparisons between groups of different time points were performed with the Kruskal–Wallis test and Dunn's multiple testing correction, and the comparisons between groups of the same time point were performed with test t and Mann–Whitney; p‐values < 0.0001 are reported as exact numbers