Search for: [Abstract = "ll children with severe course of COVID\-19 had imaging tests taken \(i.e., lung ultrasound \(LU\), chest X\-ray, and highresolution computed tomography \(HRCT\)\). All children were subject to careful medical observation and treatment in accordance with current guidelines. Data on the course of hospitalization was also recorded in a planned and strictly structured manner in a specially designed database \(the length of hospitalization, the length of oxygen treatment, antiviral treatment, systemic steroid therapy, pediatric intensive care unit \(PICU\) admission, respiratory therapy, and deaths\). 4.5. Patients and methods \(applies to article No 1\) This study comprised 1407 patients with COVID\-19, hospitalized between March 2020 and April 2022 in the Department of Infectious Diseases and Pediatrics, Zeromski Specialist Hospital in Krakow\: 112 \(8%\) from the first wave \(1 March to 30 September 2020\), 175 \(12.4%\) from the second \(1 October 2020 to 31 January 2021\), 195 \(13.8%\) from the third \(1 February to 31 May 2021\), 511 \(36.3%\) from the fourth \(1 October 2021 to 15 January 2022\), 414 \(29.5%\) from the fifth \(16 January to 30 April 2022\). Demographic characteristics, clinical presentation, laboratory findings, lung imaging, outcomes, and final diagnoses were compared between the subsequent pandemic waves caused by different SARS\-CoV\-2 variants. 4.6. Patie"]

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