Objective: comparative study of the etiological structure of community-acquired pneumonia in SARSCoV-2 “+”and SARS-CoV-2 “-“ patients who sought help from medical organizations in the Rostov Region.Materials and methods. Biological material from 508 patients diagnosed with community-acquired pneumonia who were on outpatient treatment or in hospitals in Rostov-on-Don was studied. Verification of respiratory viruses, including SARS-CoV-2 RNA, as well as M. pneumoniae, C. pneumoniae, and L. pneumophila was performed by polymerase chain reaction in nasopharyngeal smears. Bacteriological analysis of sputum was carried out using differential diagnostic media, identification of isolated pathogens was carried out using time-of-flight mass spectrometry on Autoflex (Bruker Daltonics) with BioTyper 3.0 software.Results and discussion. During the spread of a new coronavirus infection in the Rostov Region, the main etiological agent of community-acquired pneumonia is the new SARS-CoV-2 coronavirus. Specific character of pneumonia in patients with laboratory-confirmed COVID-19 is a higher incidence of mixed infection of both viral and bacterial etiology. Against the background of detection of a new coronavirus infection in patients with pneumonia, cases of detection of other types of coronaviruses have been registered (HKU-1,OC43, HL-63 and 229Е). The most common etiological agent of bacterial pneumonia in patients was Streptococcus spp., both in patients with COVID-19-associated pneumonia and in patients who tested negative for SARS-CoV-2. Coronavirus patients represent a high risk group for the development of mycotic lung lesions.

Purpose: to analyze the epidemiological situation for a new coronavirus infection (COVID-19), to identify some regional features of the Rostov region that contribute to spread of infection.Materials and methods: when assessing the epidemiological situation for a new coronavirus infection in the Rostov region, we used information provided by the Department of the Federal service for supervision of consumer protection and human welfare in the Rostov region. Processing of statistical data was performed by means of generally accepted method.Results: the spreading of a new coronavirus infection in the Rostov region is uneven in nature. When differentiating the territories of the region we identified groups of municipalities with a very high, medium and low number of patients. The administrative territories division of the Rostov region into the “Rostov urban agglomeration” and cluster of municipalities in which pronounced factors and conditions determining the “pendulum” migration of the population are absent, allow analyzing the specific features of the region and identification of territory with the highest risk of epidemic process intensification of a new coronavirus infection.Conclusions: the carried out differentiation of municipalities made it possible to identify and analyze some territorial features of the Rostov region, contributing to the spread of a new coronavirus infection. The obtained results could be used for development of measures aimed at reducing intensification of the epidemic process COVID-19 in condition infection.

Представлены результаты исследования этиологических агентов бактериальной и вирусной природы у пациентов с диагнозом внебольничная пневмония, ассоциированной с COVID-19. В период распространения новой коронавирусной инфекции в Ростовской области основным этиологическим агентом внебольничных пневмоний является новый коронавирус SARS-CoV-2. Особенностью ВП у пациентов с лабораторно подтвержденным COVID-19 является более высокая частота микст-инфекций как вирусной, так и бактериальной этиологии. На фоне выявления у пациентов с ВП РНК SARS-CoV-2 зарегистрированы случаи обнаружения коронавирусов других типов (HKU-1,OC43, HL-63 или 229Е). Наиболее часто этиологическим агентом ВП бактериальной природы у пациентов являлись бактерии рода Streptococcus как у пациентов с ВП, ассоциированной с COVID-19, так и у пациентов с отрицательным результатом на SARS-CoV-2.

Purpose. A dynamic comparative analysis of the results of identification of Vibrio cholerae (V. cholera) isolates from water and human specimens isolated during the monitoring of cholera throughout the Russian Federation in 2013–2019.Materials and methods. Total 385 strains of V. cholerae O1 serogroup (including one toxigenic V. cholerae O1 El Tor Inaba — Rostov region, 2014) and the R-variant from environment objects were identified in the territory of 21 regions of the Russian Federation.Results. It was found that 91% of the strains were isolated in 7 regions of the Russian Federation: Republic of Kalmykia, Krasnodar Krai, Transbaikal Krai, Khabarovsk Krai, Primorsky Krai, Rostov region and Irkutsk region. 2.3% of strains were atypical in their agglutinability, and 75.3% of strains had atypical phagosensitivity. Phagotypes were identified for 13.2% of strains isolated in 11 administrative territories. Phageotype 11 included 48.8% of the strains isolated mainly in the Transbaikal Krai. Non-toxigenic strains of V. cholerae nonО1/nonO139 (n = 46) were isolated from 43 patients with acute intestinal infections and otitis in 8 regions of Russia. PCR-typing of 377 non-toxigenic V. cholerae strains demonstrated that they belong to 13 clusters and 71 genotypes. Strains with unique genotypes (probable cases of importation) and with the same genotypes repeatedly isolated in different years in one or several territories of the Russian Federation were identified, indicating the prevalence of strains in environment throughout the country.Conclusion. The results allowed us to characterize the epidemiological situation of cholera in Russia (in terms of the environment contamination with V. cholerae O1) as unstable, but not significantly changed over the past 7-year period. These data are important for substantiating the forecast for further development of the epidemiological situation.

Aim. Analysis of the phenotypic characteristics and identification of peculiarities of the genotypic organization in non-toxigenic strains of cholera vibrios having different origin, isolated in Russia. Materials and methods. A sample of 548 non-toxigenic strains obtained using the author’s updated GIS “Cholera 1989–2014” was used. PCR genotyping was carried out in accordance with the patented “Method for the identification of non-toxigenic strains of cholera vibrio O1 serogroup using PCR to isolate genetic determinants.” Cluster analysis was performed applying the UPGMA method. The dendrogram was constructed using MEGA 5 software package.Results and discussion. Representative cultural-morphological, serological and biochemical properties of V. cholerae strains have been specified. The variability of the studied strains on the basis of phagolizability has been revealed. Unique phage-types not previously encountered in Russia have been identified. The population of non-toxigenic strains of cholera vibrio O139 serogroup is genetically homogeneous in contrast to V. cholerae O1 El Tor isolates and has identical PCR genotypes. The universality of the PCR genotyping by 14 target genes has been shown to differentiate the studied strains of V. cholerae O1 and O139, as well as to identify disparities among O139 strains isolated in different geographical regions of the country.