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. 2021 Apr 20;18(8):4376. doi: 10.3390/ijerph18084376

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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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Study design flowchart in three Polish medical institutions (A.-University Hospital in Opole; B.-Hospital no. 4 in Bytom and C.-Eko-Prof-Med Healthcare Unit (HCU) in Miasteczko Śląskie; HCWs-health care workers; $n_{I}$ -first blood collection; $n_{I I}$ -second blood collection; RT-PCR-Reverse Transcription Polymerase Chain Reaction), CRP-C-reactive protein.