[Effectiveness of the use of nutrient media in isolation of Yersinia].

Three liquid nutrient media (phosphate buffer medium, 1% buffered peptone water pH 7.6-7.7, buffer casein yeast medium) and live solid media (Endo's, Serov's, and differential diagnostic medium with bromothymol blue, made in this country, and two foreign ones, agar deoxycholate and McConkie's) are compared in examinations of the material from 213 patients with acute intestinal diseases and from 460 small mammals.

[Detection of virulence markers in clinical strains of Yersinia].

The dispersion of plasmid pYV associated virulence markers in 474 Yersinia strains isolated from people has been studied. The ability to autoagglutination, calcium dependence of growth and the specific antigens were identified in 157 strains of traditionally pathogenic Yersinia enterocolitica serovars 03, 09, Yersinia pseudotuberculosis serovar I. They were not found in 223 strains of other 12 serovars of Yersinia enterocolitica, in 40 strains of Yersinia frederiksenii, Yersinia kristensenii, Yersinia intermedia.

[The prevalence of Yersinia and its serologic variants in patients with acute intestinal diseases of undetermined etiology in Leningrad].

Among Yersinia enterocolitica strains of 32 serovars, proposed as typing strains, some strains were found to belong to new species. Y. enterocolitica sensu stricto was represented by 21 serovars in the collection of typing strains.

[Serological variants of Yersinia enterocolitica circulating in different geographical areas of the Soviet Union].

The serological variants of a number of Y. enterocolitica strains isolated in different regions of the USSR (1,085 strains isolated from humans and animals in the North-West of the RSFSR, 76 strains isolated from humans and animals in the Krasnodar Territory and 114 strains isolated from humans only in the area east of Lake Baikal) were determined. 25 serological variants were registered in these 3 regions of the USSR.