Search for: [Abstract = "nts and methods \(applies to article No 2\) 1405 patients with COVID\-19 hospitalized between March 2020 and April 2022 in the Department of Infectious Diseases and Pediatrics, Zeromski Specialist Hospital in Krakow were included in the study. To assess the COVID\-19 characteristics depending on age, they were assigned to three study groups\: 567 infants \(0–12 months\), 470 toddlers \(1–5 years\), and 368 children \(5–18 years\). Demographic characteristics, clinical presentation, laboratory findings, lung imaging, outcomes, and final diagnoses were compared between the age groups. 4.7. Patients and methods \(applies to article No 3\) 70 among 2338 children \(3%\) hospitalized in two centers between 23 March 2020 and 30 September 2022 met the criteria of COVID\-19 severe course. In the first stage of the analysis, the population of children with severe COVID\-19 was described in detail. Next, among children diagnosed with severe COVID\-19, the following subgroups of patients were identified for further analysis\: 1\) children who did not require mechanical ventilation\; 2\) children requiring mechanical ventilation\; 3\) children who died due to severe COVID\-19. In the final stage of the analysis, the data of children with severe COVID\-19 was also compared with the data of children who were hospitalized due to COVID\-19, but did not meet the criteria for severe"]

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