Search for: [Abstract = "On 11 March 2020, the World Health Organization \(WHO\) announced the COVID\-19 pandemic. In the first three years, over 6.5 million deaths for COVID\-19 were reported to WHO, mainly from Europe and North America. The real number of deaths in the world is assessed to be three times larger. From the beginning of the pandemic, children were reported all over the world to present with an asymptomatic or mild course of the severe acute respiratory syndrome coronavirus 2 \(SARS\-CoV\-2\) infection. Children were reported to constitute 1–2% of COVID\-19 patients and it was very rare that admission to hospital was required. Nevertheless, during the following years, the percentage of hospitalization among children has increased since the emergence of more contagious \(SARS\-CoV\-2\) variants and the achievement of a high vaccination rate in adults. The first pediatric deaths were reported. Such situation required thorough surveillance and ongoing update on COVID\-19 management for children, and also risk group identification, testing criteria, and indications for hospitalization. 4.2. Research purpose, research problems The main aim of the study was to describe the COVID\-19 characteristics of hospitalized children based on findings from over 1400 pediatric patients, especially in terms of clinical presentation, laboratory findings, trends in pandemic waves, and outc"]

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