Search for: [Abstract = "omes. Specifically, the following issues were analyzed\: 1. What were the differences among the subsequent pandemic waves due to SARSCoV\- 2 variants – because the clinical presentation of COVID\-19 has been changing due to the following SARS\-CoV\-2 variants and raising herd immunity. 2. What was the relation between the course of pediatric COVID\-19 and age – because from the beginning of the pandemic, age was reported as one of the most important risk factors for a severe course, hospitalization, and death due to COVID\-19. 3. What were the characteristics of the patients with a severe course of the disease. Especially, I focused on the possibilities for prediction of the severity of COVID\-19 on admission to the hospital. 4.3. Studied population Patients aged 0–18 years with laboratory\-confirmed COVID\-19, hospitalized in the Department of Infectious Diseases and Pediatrics, Zeromski Specialist Hospital in Krakow, and The Children University Hospital, Jagiellonian University Collegium Medicum, Krakow, Poland were included in the study. All patients were symptomatic. 4.4. Definitions SARS\-CoV\-2 infection was diagnosed using a positive reverse transcription and real\-time polymerase chain reaction \(RT\-PCR\) test. Since 30 October 2020, second\-generation antigen tests from a nasopharyngeal swab were performed in certified laboratories. The severe cas"]

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