Introduction and Objective.Pneumonia is defined as an acute infection of the lung parenchyma caused by various pathogens. It remains a leading cause of morbidity and mortality in the paediatric population globally. The aim of this study was to disclose most common aetiology of pneumonia among children hospitalized in the University Children's Hospital in Lublin, Poland, from 2010-2020. Materials and method. This retrospective study included 2,250 patients in the age rage from 2-227 months, hospitalized in the
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