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Currently, there is a decrease in the total number of organizations for summer recreation of children in the country while the share of organizations of group II of sanitary and epidemiological well-being among them remains at a consistently high level that determines the potential risk of harm to the health of the child population. At the same time, there is an increase in the number of children with a pronounced health-improving effect. So, it becomes necessary to analyze the information content of modern criteria for assessing the effectiveness of health improvement and to search for ways to resolve the noted contradictions., Objective: Analysis and scientific and methodological substantiation of modern criteria for assessing the effectiveness of children's health improvement in recreation organizations (camps)., Material and Methods: An analysis of the literature data, our own research results' systematization and effectiveness assessment of the health improvement of 195 children aged 10 to 15 years (112 girls and 83 boys) belonging to I and II health groups and vacationers in the inpatient organization of the Samara region in the 2019 summer campaign were carried out. Anthropometric, physio-metric, and bio-impedance metrics were studied in two stages (on the 1st or 2nd day of arrival and 1 day before the camp leaving). In a comparative analysis the differences were considered significant when p <0.05., Results: Stationary rest and recreation organizations in the all-Russian structure of recreation organizations for children account for 5.8%. During staying in the camp, there was a significant decrease in the proportion of girls with underweight ( p =0.039); among boys no significant changes were found. The general trend towards a change in the level of physical development is not statistically significant. Bio-impedance analysis revealed only 51.3% of children with changes in indicators characterizing the health-improving effect. The tendencies to change in the proportion of children with different levels of arm muscle strength and lung capacity during the staying in then camp are statistically significant. Correlations were established between muscle strength with basal metabolism ( r =0.86) and muscle mass ( r =0.86), as well as negative links between average strength and the percentage of adipose tissue ( r = -0.52). During the staying in the camp, the 4 cases of acute respiratory infections were registered that did not affect the assessment of the recovery effectiveness., Conclusion: In order to assess the health-improving effect among children during one trial in the camp, the leading functional signs are muscle strength of the arms and vital capacity of the lungs. Additional criteria can be the morbidity during the staying in the camp, and in terms of the nutritional status analysis - the results of bio-impedance analysis. To assess the physical development at the beginning of the camp trial, the use of regional regression scales is informative that requires a corresponding explanation in the documents. In turn, the data from the baseline measurements should be used to build individual health measures during the staying in the camp.

The paper describes a clinical case of visceral leishmaniasis in a three-year-old child who Was born and is a permanent resident in Penm. Its clinical symptomatology; laboratory and instrumental findings; stages of a diagnostic search for fever of unknown origin concurrent with hepatosplenomegaly and pancytopenia; differential diagnosis with hemoblastosis; and an epidemiological history are detailed. Visceral leishmaniasis was diagnosed at examination of bone marrow specimens. The paper presents the positive results of combination etiopathogenetic treatment, which are confirmed by the time course of clinical changes and laboratory findings.

In the national strategic documents of the Russian Federation's leading destination for health development in the coming years is preventive. In this connection it seems to be necessary to study the causes of the impairment of the formation of morphological and functional indices in today's schoolchildren, the establishment of controlled factors in educational institutions and the substantiation of the system of preventive measures for children and adolescents. The performed study of the physical development of Moscow schoolchildren revealed the discoordination of the morphofunctional development. Besides that there were revealed factor-forming morphofunctional state in children and adolescents. The results of performed studies allowed us to formulate preventive recommendations aimed at optimization of the morphofunctional state of the organism of schoolchildren.

An assessment of the functional state of the organism in 2929 Moscow and 2043 Kiev schoolchildren aged 8 - 16 years. It was shown that in terms of main physiometric indices ofphysical development Moscow and Kiev children 8 - 16 years differ from each other There were established statistically significant difference in the force capacities: in Kiev children aged 8 - 9 years muscle strength was significantly higher than that of their peers in Moscow. The force capacities of 10 - 14 year old girls and 16 - year old boys residing in Kiev were acknowledged to be significantly lower than that of in children of the same age residing in Moscow. Respiratory capacities in Kiev schoolchildren in all age and gender groups were significantly lower than in Muscovites of the same age. It was suggested to activate preventive measures aimed at increasing the functional capacities of the cardio-respiratory system, in the first place for the children - residents of Kiev.

In modern social economic and ecologo-hygienic conditions of big cities all age groups of children and adolescents aged 8-15 years present a significant decrease of functional indicators (muscle force of the right hand) in comparison with their peers of 60s and 80s of the XX century. The similar findings occur in other regions and age groups. The analysis of the reasons of this phenomenon is one of key problems for researches.

Physical development was assessed in 2329 Moscow schoolchildren and 1433 Kiev ones aged 8 to 11 and 15 to 17 years. The Moscow and Kiev children aged 8 to 11 years did not differ in the basic anthropometric indices of physical development and force capacities. Gracilization processes were prevalent in the Kiev schoolchildren. Statistically significant differences were established in respiratory capacities: lung capacity was significantly higher in the Moscow children aged 8 to 10 years than in the Kiev ones of their age. Climatic and geographical features were found in the physical development of the Kiev teenagers: significantly higher chest circumference was observed in 15-16-year-old girls and 15-year-old boys than in the Moscow children of the same age. It is stated that the force capacities of the Kiev teenagers were significantly lower in all age-sex groups than in the Muscovites of the same age. It is proposed to activate preventive measures aimed at enhancing the functional capacities of the cardiorespiratory system primarily in the children living in Kiev.

Regional modified regression scales, complex schemes, and centile tables are highly informative regional norms-based tools employed in the preventive maintenance system. It is shown that estimates of physical development in preschool and school children groups obtained by these methods are closely related to the sanitary and epidemiological welfare in different types of educational institutions, completeness of implementation of preventive and curative measures, factors characterizing early childhood and quality of children's life, socio-psychologic family portraits. The use of regional modified regression scales and complex schemes revealed significant relationship of physical development indices and distribution of children between health groups. It is concluded that methods allowing for comprehensive evaluation of physical development ensure collection of the most valuable information during preventive examination.