Yersinia pseudotuberculosis is known to produce a novel superantigen designated Y. pseudotuberculosis-derived mitogen. In the present study, we demonstrated that there was a distinct geographical heterogeneity between the Far East (higher prevalence) and Europe (lower prevalence) in the prevalence of the ypm gene encoding the superantigen among Y. pseudotuberculosis strains.
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Yoshino et al. (1995) studied this question.
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