[The value of glucose-positive coliform bacteria and potentially pathogenic bacteria as indicators of epidemiological safety of tap water].

Due to intensive anthropogenic pollution of water environment generally accepted indicators of epidemic security of water bodies - common bacteria and thermotolerant coliform bacteria do not always permit to obtain an objective characterization of bacterial contamination of tap water. From the point of view of authors the integral index - glucose positive coliform bacteria most adequately reflect the sanitary-hygienic and epidemiological situation of water bodies. In monitoring for bacterial quality of tap water it is advisable to determine glucose positive coliform bacteria, that will provide the relevance of estimation of the epidemiological safety of water use.

[New methodological approaches to the detection and quantitative registration of Salmonella in the study of water objects].

The paper gives data on the use of techniques to detect and register Salmonella in the water objects, by applying a new liquid nutrient medium. Experimental and field studies have shown its advantage over the accumulation media widely used in practical healthcare. It has been ascertained that the nutrient medium not only accumulates biomass, but also provides the restoration of the biological properties of uncultivated Salmonella species.

[Evaluation of epidemic risk from pathogenic and opportunistic bacteria isolated from water of its various use types].

The investigation was concerned with wild gram-positive and gram-negative microorganisms (E. coli spp., Klebsiella spp.

[Monitoring of bacterial contamination of water reservoirs in the Rostov region].

The paper estimates the epidemic value of indicators for microbial contamination of waters from their main supply sources (waters from the Tsimlyansk Reservoir and the Nizhni Don River and drinking waters from the towns of Azov and Tsimlyansk) in the Rostov Region. The Tsimlyansk Reservoir water met the SanPiN 2.1.

[Microbial risk assessment to establish water quality-enteric infection morbidity relationships].

The authors have constructed a mathematical model for the cause-and-effect relationship between acute enteric infection (AEI) morbidity and the levels of water bacterial contamination and the properties of microorganisms. New procedures were proposed to calculate a risk for water-borne AEI depending on the sanitary-and hygienic conditions of water use and the degree of water contamination in the direct isolation of the causative agents of pathogenic and opportunistic infections, which allow the calculation and prediction of the occurrence of AEI at the individual and population levels.

[Significance of indicator microorganisms in the assessment of a microbial risk in the occurrence of epidemic hazard in drinking water use].

Summary. The paper provides comparative characteristics of water quality in the assessment of a risk for intestinal infections in drinking water use. It has shown that of the greatest predictive value is direct detection of potentially pathogenic microorganisms, as well as the integral indicator determined by glucose fermentation, such as glucose-positive coliform bacteria.

[Improving the standard and methodological basis for bacteriological monitoring the quality of drinking water].

The paper presents materials to provide a scientific rationale for the microbiological parameters enhancing the efficiency of drinking water quality control from the point of view of reliability in the provision of epidemic water consumption safety (coliform bacteria being identified by the glucose index; E. coli). Based on the criterion assessment of the significance of microbial water contamination in relation to morbidity rates, the authors have been developed bacteriological standards--the absence of microorganisms in a 300-ml water sample.

[Problems of epidemic safety of drinking water use by the population of Russia].

Quantitative relationships were studied between the indicators (common coliform bacteria (CCP), glucose-positive bacteria (GPB), thermoduric bacteria (TDB), coliform bacteria, enterococci, clostridia, coliphages) and the opportunistic (Pseudomonas aeruginosa, Proteus, Klebsiella) and pathogenetic (Salmonella and intestinal viruses) microorganisms at the stages of effluent purification and decontamination, in processes of self-purification in the water reservoirs and of water preparation at water-supplying stations, as well as in the association with the incidence of acute intestinal infections of bacterial and viral genesis in different climatic zones of the country. Salmonella and the opportunistic bacteria of the Enterobacteriaceae family and Pseudomonas aeruginosa were found to be highly resistant to detoxifying agents and environmental factors, adaptable, able to reproduce in pure water, to long survive in underground waters, and to accumulate when water is desalinated at the erections. The cases of intestinal infections were found in the population using the portable water of the standard quality in terms of E.

[The elaboration of a complex of indices for the intensiveness of an experimental infectious process to be used in hygienic research].

Study with the chromium, barium, aniline, lead acetate, phosphamide and ambush show, that changes in the resistance levels measured by the complex of the immunological, biochemical parameters and of the resistance to infection are connected. Therefore the integrative index of infection intensity was worked out.