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In order to investigate the virulence of Y. enterocolitica isolated in Korea, all necessary experiments were done including several virulence determinating tests-autoagglutination test, calcium-dependency test, HeLa cell invasion test, Sereny test, crystal violet binding test, and electrophoresis fo...

In order to investigate the virulence of Y. enterocolitica isolated in Korea, all necessary experiments were done including several virulence determinating tests-autoagglutination test, calcium-dependency test, HeLa cell invasion test, Sereny test, crystal violet binding test, and electrophoresis for plasmid pattern. The obtained results are as follows: The virulent strains of Y. enterocolitica revealed positive reactions on autoagglutination test, cacium-dependency test, and drystal violet binding test, while the avirulent strains did not. A positive reaction was observed only at $37^{\circ}C$ implying that the expression of virulence is temperature-dependent. In Sereny test, the standard reference virulent strain (serotype 0:8) showed positive reactions while the virylent experimental strains (serotype 1:3, 0:9) revealed negative results, which indicates that the virulence of Y. enterocolitica in experimental animals varied according to their serotypes. Most of the virulent strains contained 36-38Mdal plasmids, but the avirulent strains did not. In addition, it was noted that autoagglutination, calcium-dependency, and crystal violet binding were related to the presence of plasmids.

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