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. 2023 Jun 30;11(7):1183. doi: 10.3390/vaccines11071183

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© 2023 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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Blood collection periods scheme according to each vaccine group. Serum from individuals immunized with BNT162b2, ChAdOx1 nCoV-19, and CoronaVac was collected at T1 (pre-vaccine), T2 (1 month after application of the second dose), T3 (4–6 months after application of the second dose or pre-third dose), and T4 (1 month after application of the third dose). Individuals received first and second doses of the same vaccine and most received BNT162b2 as the third dose. The numbers of individuals collected in each period are indicated inside parentheses. “T” stands for time point. Produced in BioRender.