[PHENOTYPICAL CHARACTERISTICS AND GENETICAL DETERMINANTS OF PATHOGENICITY OF STAPHYLOCOCCUS AUREUS, ISOLATED FROM BACTERIAL CARRIERS, RESIDING ON THE TERRITORIES WITH VARIOUS LEVELS OF ANTHROPOGENIC POLLUTION OF AIR ENVIRONMENT].

Aim: Comparative phenotypical and genetical evaluation of pathogenic potential of Staphylococcus aureus strains, isolated from resident bacterial carriers, residing on the territories with anthropogenic pollution of air environment of varying intensity.

Materials And Methods: S. aureus, isolated 3 times from mucous membrane of the anterior of nose from 210 children, were the object of the study. Anti-carnosine activity and biofilm formation was determined by a photometric method, antibiotics resistance--by a disc diffusion method. lukS, lukF, sec 3, clfA, clfB, agr and mecA gene detection, that are associated with S. aureus, was carried out by PCR.

Results: S. aureus strains, isolated from children, residing on the territories with a high level of anthropogenic pollution of air environment, were characterized by antibiotics resistance, higher values of anti-carnosine activity, 2 times more frequently formed biofilms with higher values of the parameter. clfA and clfB genes, that determine colonization of mucous membranes, and agr gene were detected in all the studied S. aureus strains, lukF and sec 3 genes were detected in 20-40% of the strains, isolated from children, residing on both territories. mecA and lukS genetical determinants were not detected.

Conclusion: S. aureus, isolated from children, residing on the territories with high levels of anthropogenic pollution of air environment; were characterized by higher values of the studied factors of persistence and stability against antibiotics. Genetical determinants of pathogenicity were not detected in S. aureus, isolated from individuals, residing on both territories.