Vol 93, No 6 (2016)

Aim. Study the effect of microgravitation on the formation of Lactobacillus plantarum 8PA-3 bacterial biofilms in the conditions of space flight. Materials and methods. Information on the effect of microgravitation on the development of biofilms was obtained during study of L. plantarum 8PA-3 probiotic lactobacilli in special equipment in the process of execution of space experiments in the Russian segment of the International Space Station. Comparative analysis of growth of plankton and biofilm forms of cells developing in the conditions of space flight and surface conditions was carried out by microbiologic and electron-microscopy methods using scanning and transmission electron microscopy. Results. Accelerated dynamics of formation of L. plantarum 8PA-3 lactobacilli biofilm on the surface of polymer substrate was shown for the first time during the space experiment. Microbiological analysis of the bacterial culture has also confirmed the accelerated growth of L. plantarum 8PA-3 under microgravitation compared with surface conditions. Ultrastructure of plankton form of L. plantarum 8PA-3 taking part in formation of biofilms in conditions of microgravitation was detected for the first time in the space experiment. Conclusion. Data on comparative electron-microscopic analysis obtained in space experiments are important for scientific justification of the effect of microgravitation on bacterial communities developing as biofilms - the most natural form of existence of microorganisms. The results obtained could be taken into consideration during creation of novel antibacterial means and disinfectants as well as methods of treatment of surfaces of modules of piloted space complexes that could allow to clarify methods of effective prophylaxis of biofilm spread which pose a risk of health of the crew and normal functioning of equipment in the International Space Station.

Aim. Application of the authors’ GIS «Cholera 1989-2014» for systematization of atoxigenic strains of serogroup 01 cholera vibrios (ctxAB-tcpA-, ctxAB-tcpA+), isolated from aquatic objects of the environment by pheno- and genotype. Materials and methods. A sample of 304 Vibrio cholerae 01 strains was studied. Isolation of 39 genes related to pathogenicity was carried out. Discrimination ability of a set of genes was determined by Simpson formula. Cluster analysis was carried out by UPGMA method. Results. Analysis of multi-year data on aquatic V. cholerae 01 strains in country’s subject was carried out using GIS. A possibility of systematization of phenotypes of the isolated strains by defined parameters was shown. An experimental program for detection of presence/lack of various genes and their combinations forgenotyping was developed. Conclusion. GIS was established to allow to carry out analysis of phenotypes by defined parameters, as well as implement approximate systematization of genotypes of atoxigenic strains of cholera vibrios 01 by optimally sufficient detection of 14 genes.

Aim. Evaluate the degree of epidemic risk of emergence of tick-borne encephalitis (TBE) and ixodes ticks’ borreliosis (ITB) in municipalities (MPs) of Irkutsk region with various natural-climate conditions. Materials and methods. Morbidity was compared for TBE and ITB during 2001 - 2015 in MPs of Irkutsk region located to the north or south of the 55^th parallel, i.e. in the conditions of different severity of sharply continental climate. 5-year average data were analyzed. Results. ITB morbidity was 2 - 3 times higher than TBE for all the 5-year periods in the north of the region, whereas in the south -differences were not present. Moreover, in MPs located to the north of the 55^th parallel in 2001 - 2015 a decrease of TBE and ITB morbidity did not occur, as in the south of the region. Conclusion. The lack of population morbidity reduction by TBE and ITB in the north and prevalence of the latter nosoform requires enhancement of a complex of prophylaxis measures in these MPs with an accent in development of non-specific means, including acaricidic treatment, enhancement of operations of centers of express diagnostics of transmissible infections, familiarizing of the population with the use of protective suits during periods of high activity of ticks.

Aim. Study cytokine status in mice immunized with vaccines containing acellular pertussis component. Materials and methods. Vaccines developed in Mechnikov RIVS - acellular pertussis vaccine (aPV) and adsorbed pertussis-diphtheria-tetanus vaccine (aDTaP), containing a complex of protective antigens of pertussis microbe - were used in the study. Fi (CBAxCsyBle) line mice weighing 12 - 14 g were immunized intraperitoneally 3 times at an interval of 7 days with aPV and aDTaP at human immunization dose (0.5 ml), containing 25 pg of pertussis component. Intact mice were used as a control group. Levels of IFN-y, IL-2, IL-4, IL-5, IL-12 cytokines were determined after each immunization in enzyme immunoassay using commercial test-systems from Cusabio (China). Results. An increase of levels of IFN-y, IL-2, IL-5, IL-12 and lack of stimulation of production of IL-4 was established in dynamics of immune response after administration of aPV and aDTaP vaccines. Conclusion. The data obtained indicate that immunization of mice with aPV and aDTaP vaccines resulted in activation of production of cytokines characteristic for immune response during pertussis infection and immunization with whole-cellular aDTP-vaccines.

Aim. Study subpopulation structure of lymphocytes in healthy individuals under the effect of various influenza vaccines in an in vitro system. Materials and methods. Evaluation of immunephenotype features of PBMCs, activated in vitro by immune-adjuvanted and unadjuvanted vaccines against influenza in healthy individuals, was carried out by using flow cytometry method. Results. Grippol plus vaccine caused a more pronounced stimulating effect compared with subunit and split-vaccines on NK-cells, cells with markers of early activation CD45/CD25, induced the quantity of natural regulatory cells (CD4/CD25/Foxp3), increase of the number of В-cells and reduced the amount of cell types with apoptosis marker CD45/CD95. Conclusion. Immune-adjuvanted vaccine Grippol plus induced formation of effectors of both innate and adaptive immunity and possessed the most powerful potential regarding activation of various types of immune-competent cells compared with unadjuvanted vaccines.

Literature data regarding genetically determined pathogenicity factors of Y. pseudotuberculosis and associated manifestations of this infection caused by various plasmid types of the causative agent are generalized. Principal attention is given to features of cell-tissue alterations mediated by virulence plasmid pYV, as well as effects of pathogenicity of an understudied pVM82 plasmid present only in Y. pseudotuberculosis strains causing clinical-epidemic manifestation of the infections as Far East scarlet-like fever (FESLF). The data obtained on the abihty of far-eastern strains to produce YPMa super-antigen, Y. pseudotuberculosis-derivative mitogen A, probably give evidence on its key role in FESLF pathogenesis. Variability of damage of innate immunity cells and target-organs caused by various plasmid types of Y. pseudotuberculosis by virulence could determine polymorphism of clinical-morphological manifestations of this infection. In-depth understanding of dependency of immune pathogenesis mechanisms of the disease on molecular characteristics of the causative agent opens up perspectives of enhancement of diagnostics and prognosis of the severity of the course of pseudotuberculosis and yersiniosis in human in general.

In this work we analyze the epidemic situations with plague in the United States of America, which are linked to internal migration - infection in a natural focus and movement of a diseased person within the boundaries of this focus to another district, state or non-endemic territory, as well as with international migration of infected person during incubation period.

The review is dedicated to features of clinical manifestations of infections caused by Epstein-Barr virus (EBV) in HIV-infected patients, problems of diagnostics and execution of antiviral therapy in the case of combination of these infections. Individuals at AIDS stage develop tumors, associated with EBV: non-Hodgkin’s lymphomas, including Berkitt’s lymphoma, primary B-cell lymphoma ofCNS, nasopharyngeal carcinoma. Formation of lymphoid interstitial pneumonitis and leukoplakia is known to be associated with EBV. A large list of preparations that are inhibitors of EBV replication are currently known, however, there is no clear pathogenetically justified therapy scheme for patients with this infection against the background of HIV-infection.