[Molecular-biologic analysis of avian influenza virus isolates which caused epizootics on the south of West Siberia and in Crimea].

The objective of the study was to determine reasons of poultry deaths in Crimea Republic in December 2005 as well as isolation, identification, and comparative analysis of pathogens, which caused epizootics in Siberia and Crimea. During epizootic in poultry in North-East Crimea highly pathogenic avian influenza virus H5N1 was isolated. Phylogenetic analysis of RNA sequences revealed that they belong to one big cluster.

[Characterization of the natural foci of Congo-Crimean hemorrhagic fever on the territory of Ukraine].

The natural foci of the Congo-Crimean hemorrhagic fever (CCHF) in Ukraine were characterized by their geographical factors. The circulation of CCHF virus was found to occur mainly in forest and forest-steppe zones irrespective of the location of administrative regions. The territories found to be most favorable for the prolonged existence of the focus of CCHF were those having high humidity.

[Cholera prevalence worldwide and in Ukraine].

In the course of the 7th pandemic cholera morbidity has been registered in 163 countries of the world. 5 periods in the development of the pandemic hav been established. The pandemic process has a pronounced tendency to growth.

[Vibrio cholerae 01, variant eltor, in the environment].

The possibilities of the autochthonous existence of V. cholerae in open water reservoirs, depending on the combined effect of different biotic and abiotic factors are considered. The role of adaptive variability of V.

[Factors contributing to preservation of Vibrio cholerae in water reservoirs].

The summarized data of literature concerning the survival of V. cholerae in the environment and the influence of abiotic and biotic factors on this process are presented. These data make it possible to regard cholera as sapronosis and to form an idea of the role of factors contributing to the survival of V.