[Lecithinase activity of Vibrio cholerae and of vibrios not agglutinated by O-cholera serum]. / Letsitinaznaia aktivnost' kholernykh i ne aggliutiniruiushchikhsia O-kholernoi syvorotkoi vibrionov.

The lecithinase activities of 187 V. cholerae strains differing in their virulence and 70 cultures of NAG vibrios of different origin varied in all experimental groups. The level of lecithinase activity in the groups of V. cholerae strains having low virulence, or no virulence at all, was considerably higher than in virulent strains. NAG vibrios isolated from diarrhea patients and from samples of lake and pond water did not differ in the activity of this enzyme.

[Phage typing of nonagglutinating vibrios isolated in the territory of the USSR]. / Fagotipirovanie neaggliutiniruiushchikhsia vibrionov, vydelennykh na territorii SSSR.

The work presents the results of the phage typing of 2,437 NAG vibrio strains isolated in the USSR from patients and carriers (374 strains), from open water basins (1,675 strains), from sewage (234 strains) and from bottom silt (172 strains). Phage typing was carried out with a set of 5 phages capable of lyzing enteropathogenic NAG vibrios (phages TEPV 1, 2, 3, 4, 5). NAG vibrios isolated from humans were sensitive to phages TEPV in 45% of cases and NAG vibrios isolated from the environment, only in 29.9% of cases. Enteropathogenic NAG vibrios belonging to phagovar 1 were isolated most frequently from samples taken both from humans and from the environment. The NAG vibrios isolated from patients, carriers and the sources of water supply nearest to them belonged to the same phagovars.