In 1941 this disease affecting brook trout fingerlings was described in Canada. The most striking symptom was catarrhal enteritis. Later, in 1955, the cause of this enteritis was found to be a virus. In Europe it was first noted in 1965 in France and has since spread across Europe, including the British Isles. In Norway it was first described in trout in 1975 and in 1985 it was found in salmon. In Chile it was described for the first time in 1985.

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