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. 2022 Jul 18;10(7):1143. doi: 10.3390/vaccines10071143

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Anti-S antibody titer 1 (T1) and 4 months (T2) after the third vaccine dose. Participants with SARS-CoV-2 infection showed higher anti-S antibody levels than those without infection. In addition, in non-infected participants, the antibody level at 4 months after the third dose of vaccination was significantly lower than at 1 month.