PATHOGENICITY OF 42–44 MDAL PLASMID POSITIVE AND NEGATIVE YERSINIA PSEUDOTUBERCULOSIS I AND YERSINIA ENTEROCOLITICA 0:8 AND 0:9 STUDIED IN THE GUINEA PIG EYE MODEL (SERÉNY TEST)

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Abstract
When virulence plasmid (42–44 Mdal) positive and negative Yersinia pseudotuberculosis I and Yersinia enterocolitica 0:8 and 0:9 were tested in the guinea pig eye model the following order of pathogenicity was observed: Plasmid-positive Y. pseudotuberculosis I (death of the animal) > plasmid-negative Y. pseudotuberculosis I plasmid-positive Y. enterocolitica 0:8 (severe conjuntivitis) > plasmid-positive Y. enterocolitica 0:9 (mild conjuntivitis) > plasmid-negative Y. enterocolitica 0:8 and 0:9 (no effect).