[Experimental study of mixed infection by Vibrio cholerae and Salmonella typhi].

Mixed infection caused by V.cholerae and S.typhi was studied on guinea pig gall-bladder, used as an experimental model.

[A comparative evaluation of the growth of Yersinia enterocolitica on elective media].

The aim of the work has been to find the optimal selective medium for the isolation of different serological and biochemical variants of Y. enterocolitica. Endo's, Ploskirev's, Lewin's, and bismuth sulfite media have been under study.

[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.