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A total of 183 strains of Yersinia ruckeri, isolated from a wide variety of sources, were studied with respect to their plasmid profile and ribotype patterns. Eight plasmid profiles and 11 ribotypes were demonstrated, with one profile being predominant by both typing methods. The results suggest a clonal structure for this species, with a predominant clone being responsible for most of the outbreaks worldwide. The results of a long-time survey in several fish farms in Spain and Denmark seem to support this idea.
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Domı́nguez et al. (1998) studied this question.
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