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A specific disease of sheep and goats, caused by the orf virus. This virus is transmissible to man and characterised by vesiculation and ulceration of the infected site.

Synonym: contagious ecthyma, contagious pustular dermatitis, scabby mouth, soremouth.

Origin: O.E. Orfcwealm, murrain, fr. Orf, cattle, _ cwealm, destruction