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The aim of the research is to improve the diagnosis of disturbances of cell energy in children with chronic nonspecific pulmonary diseases (CNPD) in the remission stage by the methods of detection of cytochemical changes of the energy status and recording the percentage of immune-competent cells of blood with the low membrane potential of mitochondria (MPM). 77 children were examined, including 66 (83%) with lung malformations, and 11 children (17%) with chronic nonspecific lung diseases as an outcome of acute/chronic lung diseases. The presence of energy deficient states was assessed by the level of activity of oxidative-reduction enzymes of succinate dehydrogenase, alpha-glycerophosphate dehydrogenase, lactic dehydrogenase in lymphocytes of the peripheral blood and percent ratio of lymphocytes with low MPM. It was found out that in 53.2% of the examined children even in the remission stage there were identified the signs of mitochondrial insufficiency when the parameters of metabolic activity of enzymes in lymphocytes were significantly lower than the norm. The cluster analysis of the obtained data allowed identifying the parameters typical for energy deficient states of the organism of the child that demand the correction by energotropic medications.

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Introduction. The global spread of SARS-CoV-2 coronavirus infection worldwide determines the need to study the clinical features, complications, extrapulmonary manifestations and long-term consequences of the infection in children. While many studies have been described in adult patients, there are limited data analyzing the clinical course of the disease in pediatric patients infected with SARS-CoV-2. Aim. Review of the literature containing currently reported cases of SARS-CoV-2 infection in children to present the state of the art, understand the direction of research and unresolved issues. Materials and methods. An analysis of publications containing data from studies of SARS-CoV-2 cases in children was carried out. Results. Researchers from different countries agree that children are less susceptible to COVID19. This can create a dangerous situation, which can lead to a weakening of attention to children. Although their clinical manifestations are mainly mild to moderate symptoms, nevertheless, severe cases of the disease occur in children, which can lead to death. Conclusion. The complexity and variability of COVID-19 manifestations support the hypothesis that further research is needed on the long-term and chronic symptoms of COVID-19 in children. Failure to understand the underlying biological mechanisms behind these persistent symptoms increases missed opportunities to identify patients at risk of chronicity in order to prevent such conditions and seek rehabilitation approaches for children with COVID-19.