"In this study, we found that the antibody and neutralizing antibody titers increased significantly at 2 weeks after the second dose of the BNT162b2 vaccine and decreased sharply at 4 months. Overall, the antibody and neutralizing antibody titers tended to be higher among women and younger individuals, but the groups’ values did not differ significantly, and all subgroups exhibited a rapid reduction in these values 4 months after the second vaccination.
Previous studies also demonstrated that a marked gradual decrease in the numbers of antibodies and neutralizing antibodies occurred after vaccination."
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