[Phenomenon of pili formation in Yersinia enterocolitica].

In Y. enterocolitica strain, serovar 0:10, the capacity for the formation of pili inducing the mannose-resistant hemagglutination (MRHA) of formolated sheep red blood cells was due to the presence of plasmid pYE10. MRHA-inducing pili differed serologically from Y.

[Lysogeny studies of Vibrio cholerae NAG].

To establish the presence of phages specific for V. cholerae NAG, 673 strains, 166 water samples from ponds and sewage and 674 fecal samples from patients with acute intestinal diseases have been studied; as a result, 54 phage races have been isolated. The occurrence of true lysogeny in V.

[Adhesion of Yersinia pseudotuberculosis serotype III].

The use of the erythrocyte agglutination test for characterizing the properties of Y. pseudotuberculosis led to the detection of a highly adhesive strain belonging to serotype III and capable of forming pili at 37 degrees C. The adhesion of the cells provided with pili was completely inhibited by the mixture of gangliosides, specific antibodies, and the preliminary treatment of erythrocytes with neuraminidases sharply enhanced the effectiveness of adhesion.

[Relationship between hemolysin and hemolysin-destructive factor activities in Vibrio cholerae of Eltor biovar].

The study of hemolysin activity, hemolysin-destructive factor (HDF) activity and cholerogenicity in 143 Vibrio eltor strains has revealed the existance of close relationship between cholerogenicity and hemolysin production, as well as between cholerogenicity and HDF activity. The negative character of conjugation between the HDF activity and the hemolytic activity of the strains under study has been established, which allows one to suggest the possibility of the regulating action of hemolysin on the synthesis of HDF (enterotoxin).