Strains of Yersinia ruckeri, the enteric redmouth (ERM) bacterium, show greater serological diversity than previously supposed. A distinct sub–group of the otherwise homogeneous serovar I (Hagerman) strains includes the salmonid blood spot (SBS) bacterium. Two other new serological varieties, serovars IV and V, have been designated.
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Stevenson et al. (1984) studied this question.
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