Table 3.

Anti-RBD IgG and neutralizing antibodies titers following first and second vaccine. doses.

Assay	After 1st Vaccine *	After 2nd Vaccine **
Days for Anti-RBD–IgG; mean ± SD (range)	11.7 ± 3.6 (7–21)	13.7 ± 5.6 days (7–38)
Anti-RBD-IgG (Geometric mean (CI95%))	0.11 (0.08–0.14)	32.55 (31.11–34.05)
Days for neutralizing Ab; Mean ± SD (range)	14.1 ± 0.4 (13–17)	6.9 ± 0.6 (4–10)
Neutralizing Ab (Geometric mean (CI95%))	23.41 (17.95–30.54)	745 (611.5–908.9)

* N = 227 participants for anti-RBD-IgG and 71 participants for neutralizing Ab. ** N = 823 participants for anti-RBD-IgG and 185 participants for neutralizing Ab.