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 sanitary and parasitological state of environmental objects in Astrakhan region. Materials and methods. A total of 45,475 samples taken from various environmental objects in Astrakhan region were analyzed. The number of unsatisfactory samples was 1.1 % (484 samples). Results. For the period from 2015 to 2019, there were studied the following samples: soil 12.5 % (5518 samples), water 6.9 % (3026 samples) and flushes from solid household surfaces 80.6 % (35501 samples). The percentage of washout samples from hard surfaces was 80.6 % (35,501 samples). The number of unsatisfactory samples was 0.003 % (1 sample). In this sample, teniid oncospheres were detected in 2019. The share of water samples was 6.9 % (3026 samples). Positive findings in the form of helminth eggs and larvae, as well as cysts of pathogenic intestinal protozoa were 3.1 % (93 samples). In addition to samples taken from environmental objects, samples of food raw materials and food products were studied 3.1 % (1430 samples). The number of unsatisfactory samples was 4.6 % (66 samples). In these samples there were found: larvae of Strongyloides stercoralis 84.8 % (56 samples), eggs and metacercariae of Opisthorchis felineus 4.5 % (3 samples), cysts of Entamoeba histolytica, larvae of Strongyloides stercoralis + Ascaris lumbricoides 3.0 % for each (2 samples for each), eggs of Ascaris lumbricoides and Enterobius vermicularis 1.5 % (1 sample) and larvae of Strongyloides stercoralis + Toxocara Canis 1.5 % (1 sample). Conclusions. The presence of mobile strongylid larvae and toxocar eggs in the soil indicates contamination of this object with the feces of invaded animals, and the presence of ascariid eggs, opisthorchis, dwarf tapeworm, teniid oncospheres and dysentery amoeba cysts in the soil indicates contamination with the feces of invaded people. The presence of eggs and larvae of helminths characteristic of animals and humans in samples taken from open reservoirs indicates, first of all, the contamination of these objects with the feces of infected people and/or animals, as well as the presumed version of water contamination with sewage. The presence of Toxocara eggs and strongylid larvae on the samples of fruit and vegetable products indicates soil contamination with the feces of invasive animals. The presence of ascarid eggs on the food indicates contamination of the soil with the feces of infested people.

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.

Study and assess food safety by parasitological indicators for 2010-2019.

The article studies and analyzes the sanitary and parasitological state of environmental objects in the Astrakhan region (flushes, water, soil) for 2016–2020. The share of samples taken from environmental objects in the structure of sanitary and parasitological studies was 88.6 %. The largest number of samples was for flushes from hard surfaces — 31 740 (82.7 %), of which 1 (0.003 %) sample did not meet the sanitary and parasitologic standards. Teniidoncospheres were found in this sample (a positive finding was noted in 2019). The share of soil samples in the structure of all sanitary and parasitological studies was 4146 (10.8 %), of which 271 (6.5 %) were unsatisfactory. Water was collected from various water bodies: centralized water supply facilities — 600 (23.9 %), surface water bodies — 676 (26.9 %), swimming pools — 955 (38.1 %), waste water — 247 (9.9 %). Also, along with waste water, their sediment was also studied — 29 (1.2 %). As a result of the work done, it was concluded that the parasitic contamination of environmental objects in the Astrakhan region continues to remain tense, as evidenced by the above indicators; the most contaminated object of the environment with parasitic agents is the soil, as evidenced by its contamination, equal to 6.5 % (water-3.6 %, flushes-0.003 %); in most cases, contamination of the soil and water of the Astrakhan region belongs to the eggs of toxocars and larvae of stroniglids, and the presence of pathogens of intestinal parasitosis in the soil and water is a potential threat to public health.