Search for: [Abstract = "children with severe course of COVID\-19 were vaccinated against COVID\-19. 4.11. Conclusions 1. The study confirmed that a life\-threatening course of COVID\-19 in children was relatively rare. However, children with pneumonia, dehydration from fever, gastrointestinal symptoms, and loss of smell and taste, as well as those with neurological symptoms, represented most of the patients requiring hospitalization. The absolute number of hospitalizations was significantly higher in the fourth and fifth waves than in the first three waves. The clinical course of the disease changed between March 2020 and April 2022 due to the predominance of different SARS\-CoV\-2 variants and raising herd immunity. 2. Many statistically significant differences in disease signs and symptoms were observed between age groups. Infants were the most often hospitalized patients in the first two years of the pandemic. The reasons for infant hospitalization were the necessity of intravenous rehydration because of dehydration in the course of high fever, vomiting and diarrhea, and appetite disorders. Severe courses requiring oxygen supplementation and antiviral therapy were more common in adolescents. 3. Risk factors for the severe course of COVID\-19 were\: young age, lack of COVID\-19 and BCG vaccination, auscultation changes, and dyspnea on admission. The presence of comorbid"]

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