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. 2021 Sep 20;9(9):1047. doi: 10.3390/vaccines9091047

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© 2021 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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Correlation between the age and neutralization percentage. (A) After 21 days of vaccination in patients without prior COVID-19; (B) in basal status in patients with prior COVID-19; (C) after 21 days of vaccination in patients with prior COVID-19. Analysis was evaluated by the Spearman’s rank correlation coefficient.