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In 2016 and 2017 the study and analysis of the prevalence of opportunistic pathogenic microorganisms (OPM), resistant to antibacterial drugs in the water reservoirs of Rostov-on-Don were carried out. 1522 strains were isolated and 101 species of microorganisms were identified. In 2016 the percentage of nonfermentative microorganisms (NFM) was 45,9 %, Enterobacteriaceae – 28,6 % and Aeromonadaceae – 24,9 %. In 2017 dominating were the representatives of Aeromonadaceae (39,1 %) and Enterobacteriaceae (37,5 %), the portion of NFM amounted to 23,0 %. The results of OPM antibiotic resistance study demonstrate that in 2017 the proportion of sensitive and monoresistant bacteria considerably decreased, and the number of strains with multiple antibiotic resistances increased. The resistant strains isolated from the external environment should be considered as possible sources of threats to biological security.

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By August 2020, more than 850000 cases of new coronavirus infection (COVID-19) caused by SARSCoV-2 were confirmed in the Russian Federation, with the Rostov Region as one of the ten most affected regions in Russia. The spread of the disease is largely determined by the state of population immunity in a certain area. Our research focuses on specific humoral immune response and estimates the level of herd immunity to SARS-CoV-2 virus among the population of the Rostov Region.Materials and methods. The study involved 3,048 people; the volunteers participating in the study were divided into seven age groups. The content of antibodies to SARS-CoV-2 was determined applying ELISA using a kit for the analysis of human serum or blood plasma for the presence of specific IgG to the nucleocapsid of the SARS-CoV-2 virus, manufactured by the State Scientific Center of Applied Microbiology and Biotechnology (Obolensk) in accordance with the instructions for use.Results and discussion. The assessment of seroprevalence to SARS-CoV-2 in the Rostov Region showed that the proportion of people positive for IgG to the new coronavirus was 16.5 %, the range of seropositive individuals in the general population was between 13.9 % and 19.1 % (p<0.05). There were no significant gender differences in the degree of seroprevalence with a positive result registered in 16.6 % of women and 16.5 % of men. A high level of humoral immunity to SARS-CoV-2 was established in individuals aged 1–17 against the background of low incidence rates, which may indicate the dominance of asymptomatic forms of the disease in this age group. The highest level of seropositivity was found in preschool children (33.6 %), students (29.3 %), employees (17.3 %), and education professionals (15.3 %).