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. 2021 May 18;9(5):522. doi: 10.3390/vaccines9050522

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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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Timing of laboratory evaluation and vaccination. T₀: blood sampling and serological test to evaluate any presence of SARS-CoV-2 antibodies. T₁ (21st day): blood sampling and serological test to evaluate the immune response developed following the first vaccine dose. T₂ (42nd day): blood sampling and serological test to evaluate the immune response developed following the second vaccine dose.