~ INCE 1946 A NUMBER of diseases of ()) cattle with many similar clinical and pathological manifestations have been reported from various parts of the United States. In general they are characterized by a febrile reaction, respiratory signs, ulcers and erosions of the oral and intestinal muscosa and diarrhea. The diseases in this group have been named virus diarrhea (New York), mucosal disease (Iowa), virus diarrhea (Indiana), necrotic rhinitis and tracheitis (Colorado), and influenza-like disease (California). Although these diseases have dissimilarities, some investigators feel they have certain symptoms and lesions suggestive of rinderpest.