The effect of bactericide Sekusept active (B SA), a peracetic acid-based preparation, on microbial strains, isolated from patients with severe infectious diseases who were treated in a regional children’s multi-specialty hospital, was studied. Based on the biochemical identification, the strains were classified as gram-negative non-fermenting bacteria (22 strains), Enterobacteriaceae family (18 strains), and bacilli - 3 strains. The biocidal activity of B SA was evaluated by the degree of inhibition of the growth of bacterial cells, existing in the planktonic form and in the form of biofilm (on a flat-bottomed plastic immunological tablet). It was shown that all the studied strains had the ability to biofilm formation, most of them (67,4%) formed moderately pronounced biofilms, and non-fermenting bacteria had a particularly pronounced coefficient of biofilm formation. The selected concentrations of B CA inhibited the growth of planktonic cells, and the ability of bactericide to prevent the formation of biofilms depended on the concentration (the most effective concentrations were 0,8 and 3,0%). Sensitivity of the strains existed in the aged biofilm to the bactericide was significantly lower, especially resistant to this effect were biofilms formed by non-fermenting bacteria and representatives of fam. Enterobacteriaceae. Our results confirm the importance of testing the effectiveness of biocides not only in accordance with standard methods developed for microorganisms in planktonic form, but also for biofilms.

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Last decades a sepsis problem attracts the increased interest in the world community. In spite of definite achievements of modern fundamental and clinical medicine, sepsis as before is characterized by significant dissemination and high lethality. The problems of sepsis spread in various countries are discussed. It is shown that annually million cases of generalized purulent-septic infections are diagnosed. Steady sepsis increase is registered in industrially developed countries. Share of severe sepsis in pathology structure varies from 2 to 43% in different territories. Sepsis still remains among leading causes of human death being characterized by essential hospital lethality (from 30,6 to 80,4%). The patient categories belonging to high risk groups of sepsis development are shown. Special attention is directed to epidemiological manifestations of this pathological syndrome in pediatrics. Features of etiologic spectrum of the sepsis causative agents, increasing etiological importance of multi-resistant bacteria (Pseudomonas aeruginosa, Klebsiella pneumoniae, Acinetobacter spp., MRSA, VRE, etc.) are demonstrated. In consideration of clinical-epidemiological, social and economic significance of sepsis, studying of its epidemiological aspects is the major direction of activities for Public Health services.

Objective: The study objective is to analyze biofilm formation in microorganisms isolated from patients of children’s hospital with severe purulent septic diseases.Methods: The ability to biofilm formation was studied in microorganisms isolated from 32 patients aged from 1 to 15 y.o. with sepsis, acute hematogenous osteomyelitis, peritonitis, and pneumonia in intensive care unit of regional general children’s hospital. Blood, phlegm, bronchial and oropharyngeal washings, wound fluid, peritoneal fluid served as specimens.Results: All tested strains have the ability to biofilm formation; moreover, the majority of them formed moderate biofilms.Conclusion: The common spread of biofilm infections can be related to the most important factors of preservation and distribution of microorganisms in health facilities which significantly limit preventive and therapeutic measures.

The causative agents of many infectious diseases can exist in the form of biofilms.The aim of the workis to study of the frequency of occurrence and the degree of activity of biofilm formation of microorganisms isolated from different locus in purulent-septic infections.Materials and methods.Fifteen strains isolated from patients with purulent-septic infections were examined. Biofilms were determined by the ability to adsorption a crystalviolet to ethanol.Results. 73,3 ± 11,4 % strains had biofilms (including gram-negative bacteria – 69,2 ± 11,9 %; Staphylococcus – 100,0 %; p < 0,05).The degree of activity of formation of biofilm by gram-negative bacteria was higher than Staphylococcus (0,302 ± 0,04 и 0,134 ± 0,01 units of optical density; p < 0,01). The highest activity of formation of biofilm was detected in K. pneumoniae isolated from patients with sepsis. Strains from clinically important locus (blood, sputum, wound discharge, abdominal fluid) had biofilms in 75,0 %; from locus of monitoring – 66,7 %. The pathogens isolated from locus of the monitoring were characterized by an average degree of activity of biofilm formation (0,180–0,360 units of optical density). Strains from clinically important locus (blood and sputum from patients with sepsis) had a highdegree of biofilm formation (more than 0,360 units of optical density). Conclusion. In most cases, strains were characterized by the presence of biofilms and differed in degrees activity of biofilm formation depending on locus.