[Substantiation of the necessity of developing a single set of phages for serotyping of Vibrio cholerae].

A single set of phages for typing different V. cholerae biotypes has been developed in the USSR and proposed for use instead of two sets of phages intended for this purpose. This set has been developed in view of the following facts: the similarity of the biological properties of V.

[Vibrio eltor strain, serotype Ogawa, the producer of cholera enterotoxin].

V. eltor strain 1310, serotype Ogawa, an original strain capable of producing cholera enterotoxin (exotoxin) in synthetic culture media, has been obtained. The exotoxin produced by this strain can be obtained in large amounts and used as cholerigenic toxoid for immunization against cholera.

[Viability and properties of cholera vibrios cultivated in mineral water].

Samples of mineral water from thermal spas of "Matsesta" health resorts were infected with cholera vibrio strains. In nonsterile mineral water diluted with distilled water 1 : 2, 1 : 4, and 1 : 8 and stored at 37 degrees C survival periods of cholera vibrio constituted 289 days for classic biotype, and 413 days for El Tor biotype. In boiled mineral water stored at 20-24 degrees C this period was 1429 days for both biotypes.

[Clinical cases of food poisoning caused by NAG-vibrios].

On the basis of bacteriological and serological studies carried out during two outbreaks of food poisoning it was found that the disease was caused by NAG-vibrios of the I Heiberg group, serotypes 5 and 34 after Sakazaki. The disease was accompanied by isolation of NAG-vibrios from feces and the washings from the stomach, it was characterized by symptoms of acute gastroenteritis and enteritis of mild and moderate severity. The incubation period lasted from 3 to 30 hours.