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The Journal of Medical Microbiology, Vol 19, Issue 2 237-246, Copyright © 1985 by Society for General Microbiology

JOURNAL ARTICLE

A simple adult-mouse test for tissue invasiveness in Yersinia enterocolitica strains of low experimental virulence

R. Bakour, G. Balligand, Y. Laroche, G. Cornelis and G. Wauters

The virulence of Yersinia enterocolitica depends on the presence of a 70-kilobase plasmid, called the Vwa plasmid. This situation is particularly favourable for studies of the mechanism of pathogenicity, but these are hindered by the lack of a suitable animal test to monitor the virulence of the human-pathogenic strains isolated outside the USA which belong to serogroups O:3, O:9 and O:5,27. We observed that, after oral administration to the mouse, the Vwa-positive strains of these serogroups produce a discrete systemic infection while the Vwa-negative strains do not. We present here a simple mouse-virulence test based on this observation.


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