[Genetic determinants of pathogenicity of opportunistic enterobacteria isolated from children with acute intestinal infections].

Aim: Detection of nucleotide sequences of genes controlling synthesis of pathogenicity factors in clinical strains of opportunistic enterobacteria isolated from children with acute intestinal infections (AII), as well as their association with resistance to antibiotics and the course of the infectious process.

Materials And Methods: 175 clinical strains obtained from children with AII undergoing treatment in Irkutsk state infectious diseases hospital (2007-2010) were studied. Primers to a number of genes detected in Escherichia coli pathogenicity islands, controlling type S and type 1 adhesion; formation of hemolysins; iron-regulatory protein synthesis; capsule formation were used in the study.

[Isolation of bacteria of the family enterobacteriaceae from plant tissues].

Bacteria of the family Enterobacteriaceae were isolated from the tissues of a number of wild and cultivated plants. All the cultures isolated had a broad spectrum of resistance to antibiotics and were highly adhesive to human erythrocytes. The studies conducted indicate the possibility of concentration of microorganisms pathogenic for humans in plant tissues.

[Indications of pathogenic viruses in water of Lake Baikal and its tributaries].

The waters of 25 large rivers falling into the Baikal Lake, their mouth water areas and open Baikal Lake areas to a depth of 500 m were for the first time in the practice of researches on the Baikal Lake were investigated for markers of hepatitis A virus and rotaviruses. The investigations showed an insignificant contamination of surface waters with pathogenic viruses. The antigens of all studied viruses and high values of bacteria from the Escherichia coli group were recorded in the areas exposed to chronic man-made pollution.