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. 2022 Jan 20;10(2):151. doi: 10.3390/vaccines10020151

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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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Changes in antibody response in people provided two samples. Changes in (a) nAb titers, (b) anti-S1 binding IgG end-point titer, and (c) anti-RBD binding IgG end-point titer between 1st and 2nd doses in non-infected (n = 10) or previously infected (n = 7) individuals who provided two samples after vaccination. Data are reported as geometric mean titer ± standard deviation. Numbers of seroconverted individuals and mean titers are shown on the top of the panels. The dotted line in a is the cut-off at 1:40.