Objective. We studied the contamination of the soil with helminth-protozoan infestations in Astrakhan region for 20102019. Materials and methods. The research work was carried out in the Laboratory of Bacteriological and Parasitological Research of the Center for Hygiene and Epidemiology in the Astrakhan Region in 20102019. A total of 10 692 soil samples were examined, and 11 384 studies were performed. The number of samples, which did not meet the sanitary and parasitological indicators was 7.0 % (753 samples). Eggs and larvae of helminths, as well as cysts of pathogenic intestinal protozoa were found in these samples. Results. During the analyzed period, 86 491 samples of sanitary and parasitological studies were selected and examined in the Astrakhan region, of which 93.6 % (80 962 samples) were samples taken from various environmental objects (water, soil, manure, flushes from solid household surfaces). The total share of soil samples in the structure of all studies of environmental objects was 13.2 % (10 692 samples). Conclusions. Parasitic contamination of the soil remains tense, as evidenced by positive findings in the form of eggs and larvae of helminths, as well as cysts of pathogenic intestinal protozoa. The presence of toxocara eggs and strongylid larvae in the soil indicates contamination of this object with the feces of infected animals. The presence of eggs of ascarids, opisthorchis, pygmy tapeworm and cysts of dysentery amoeba in the soil may indicate that this object is contaminated with the feces of persons with parasitic infestation, or about accidents on the sewer network and underflooding of soil sampling sites.

Objective. To study the parasitic contamination of the soil in Astrakhan Region based on the materials of the Center for Hygiene and Epidemiology in Astrakhan Region for 20162020. Materials and methods. The research work was carried out on the basis of the Department of Infectious Diseases and Epidemiology of Astrakhan State Medical University of the Ministry of Healthcare of the Russian Federation, the Sanitary Department of the Center for Hygiene and Epidemiology in Astrakhan Region as well as the Department of Rospotrebnadzor in Astrakhan Region. Results. In total, during the analyzed period, 4243 soil samples were selected and examined from various places in the territory of Astrakhan Region, 8486 studies were performed. The number of samples, which do not meet sanitary and parasitological standards, was 5.6 % (237 samples). The samples of soil were taken in places, regulated by normative documents, according to instructions of the Department of Rospotrebnadzor in Astrakhan Region including places of crop production (collective farms, state farms, agricultural lands) 1.7 % (71 samples), the zone of industrial enterprises, transport highways, places of application of pesticides and mineral fertilizers 4.7 % (198 samples), the territories of livestock complexes and farms 3.7 % (157 samples), the residential zone (the territory intended for residential, public (public-business) and recreational zones as well as separate parts of engineering and transport infrastructure, other objects, the placement and activity of which does not have an impact requiring special sanitary protection zones) 86.8 % (3682 samples), including the territory of children's institutions and playgrounds (kindergartens, orphanages) 83.5 % (3076 samples) of the number of all the examined selected and investigated samples from the residential zone, places of locations of water sources 0.8 % (36 samples) as well as the territories of other objects of supervision (medical and preventive institutions, beaches, places for development etc.) 2.3 % (99 samples). Conclusions. Contamination of the soil with eggs and larvae of geohelminths (toxocara eggs and strongylid larvae) indicates contamination of these objects with feces of invaded animals (the role of stray animals (dogs) in soil contamination is not excluded). The contamination of the soil with eggs of ascaris, opisthorchis, oncospheres of teniids and cysts of amoebas suggests that these objects are contaminated with sewage water resulting from accidents.

Objective. To study and analyze the contamination of environmental objects in the Astrakhan Region (by the example of soil, water, and washout samples from solid household surfaces) based on the results of laboratory studies of the Center for Hygiene and Epidemiology in the Astrakhan Region for 20112020. Materials and methods. The work was carried out on the basis of the Laboratory of Bacteriological and Parasitological Research of the Center for Hygiene and Epidemiology in the Astrakhan Region and in the laboratories of the Branches of the Center for Hygiene and Epidemiology in the Astrakhan Region in 20112020. As a whole, during the analyzed period, the laboratory and its branches conducted laboratory studies of 79 742 samples taken from various environmental objects, and 94 495 studies were performed. The number of samples that do not meet the hygiene standards was 1.01 % (806 samples). Results. The objects of sampling for the study of their parasitic purity were water, soil and wash-out from solid household surfaces. The share of water samples in the structure of all the studied samples taken from environmental objects was 7.3 % (5858 samples), of which 172 samples were contaminated with pathogens of parasitic diseases, the extent of invasion was 2.9 %. The structure of positive findings in the water samples was represented by 6 nosological forms of helminths 88.0 % (154 samples) and 3 nosoforms of protozoa 12.0 %. The share of the studied soil samples in the overall structure of sanitary and parasitological studies of the environment was 11.2 % (8895 samples). The number of unsatisfactory samples in the structure of all positive findings revealed during the study of soil, water and washouts during the analyzed period was 70.4 % (625 samples). The total soil contamination for the period of 20112020 was 7.0 % (625 samples). In most cases, helminth eggs and larvae were detected 99.8 % (624 samples). The proportion of pathogenic protozoan cysts detected in the soil was 0.2 % (1 sample). In addition to water and soil samples, the washout samples, taken from solid household surfaces were studied 81.5 % (64989 samples), of which 0.01 % (9 samples) were unsatisfactory. All positive findings in the washout samples were represented by two nosological forms of helminthiasis: Enterobius vermicularis eggs 0.012 % (8 samples) and teniid oncospheres 0.002 (1 sample). Conclusions. The presence of helminth eggs and cysts of pathogenic intestinal protozoa in the studied soil and water samples indicates contamination of these objects with the feces of infected persons and/or contamination by sewage runoff resulting from various accidents. The presence of toxocara eggs and strongylid larvae in the soil and water indicates contamination of these objects with the feces of infected animals (dogs, cats). The presence of positive findings in wastewater samples indicates poor-quality disinfection of these objects. The presence of contact helminth eggs in the studied samples of washout samples taken from hard surfaces indicates direct contact of infected persons with these samples.

Федеральное государственное бюджетное образовательное учреждение высшего образования «Астраханский государственный медицинский университет» Министерства здравоохранения Российской Федерации, 414000, г. Астрахань, Российская Федерация 2 Государственное бюджетное учреждение здравоохранения Астраханской области «Детская городская поликлиника № 3», 414000, г. Астрахань, Российская Федерация 3 Федеральное бюджетное учреждение здравоохранения «Центр гигиены и эпидемиологии в Астраханской области», 414057, г. Астрахань, Российская Федерация

Considered is the experience of development of the decision support system (DSS) in the sphere of biological safety provision. Described are the objectives, functions, and architecture of DSS. Represented are the results of operational program-testing in the model territory (the Astrakhan region). Indicated is the effectiveness of DSS for information support of the control activity over internal and external biosafety hazards. Determined are the directions for further development of DSS.