Enteric redmouth disease ERM is a systemic bacterial infection of fishes, but is known principally for its occurrence in rainbow trout, Oncorhynchus mykiss. It was first reported in the 1950s in Idaho rainbow trout and described by Rucker 1966. In recognition of that first description, the causal organism was named Yersinia ruckeri by Ewing et al. 1978.

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