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. 2023 Jan 31;182(4):1647–1656. doi: 10.1007/s00431-022-04790-4

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Daily COVID-19 cased in the Malopolska region (based on https://koronawirusunas.pl/u/wojnowe-malopolskie; access date 21.7.2022). b Number of children hospitalized due to COVID-19 in the dedicated infectious disease ward in Krakow, Poland (based on Stopyra L, Kowalik A, Stala J, Majchrzak I, Szebla J, Jakosz M, Grzywaczewska K, Kwinta P. Characteristics of Hospitalized Pediatric Patients in the First Five Waves of the COVID-19 Pandemic in a Single Center in Poland-1407 Cases. J Clin Med. 2022 Nov 17;11(22):6806. 10.3390/jcm11226806. PMID: 36,431,283). c Number of children hospitalized due to MIS-C in the Department of Pediatrics, Jagiellonian University, Krakow, Poland. d The proportion of the total number of COVID-19 sequences over time in Poland (based on www.covariants.org; access date: 21.07.2022)