. Cyclopedia of farm animals. Domestic animals; Animal products. INFECTIOUS DISEASES OF ANIMALS 139 (Fig. 122.) The enlargement gradually increases in size. It is ordinarily sharply defined from the sur- rounding tissues. Upon manipulation the tumor feels hard and dense. In the region of the throat it may be fluctuating. After a variable length of time, the tumor-like mass may soften in one or more places, rupture and discharge a rather thick, yellowish and more or less sticky, purulent Sub-. Fig. 122. Head of a steer showing actinomycosis of the jaw. stance. The discharge may continue or, as
. Cyclopedia of farm animals. Domestic animals; Animal products. INFECTIOUS DISEASES OF ANIMALS 139 (Fig. 122.) The enlargement gradually increases in size. It is ordinarily sharply defined from the sur- rounding tissues. Upon manipulation the tumor feels hard and dense. In the region of the throat it may be fluctuating. After a variable length of time, the tumor-like mass may soften in one or more places, rupture and discharge a rather thick, yellowish and more or less sticky, purulent Sub-. Fig. 122. Head of a steer showing actinomycosis of the jaw. stance. The discharge may continue or, as often happens, the opening heals temporarily only to rupture again. Animals rarely die from its imme- diate effects. Mayo reports cases in which the disease was watched for several years. In cattle, it usually appears in one or more of the following locations : the maxillary bones, the tongue, the pharynx, the skin and subcutaneous tissue, the lymph glands and the lungs. It seldom attacks other organs. Rarely it becomes generalized. Investigations have proved the specific, curative effect of the administration of iodid of potassium. [Salmon, Treatment of Lumpy jaw or Actinomy- cosis in Cattle, Bulletin No. 2, Bureau of Animal Industry, United States Department of Agriculture (1893); Wright, The Biology of the Microorganism of Actinomycosis, Journal of Medical Research, Vol. XIII, p. 349 (1905).] Epizootic lymphangitis.—Epizootic lymphangitis is described as a virulent infectious disease charac- terized by suppuration of the superficial lymphatic vessels, due to the presence of a specific organism. It is a disease of the solipeds, although Tokishige reports finding it in cattle in Japan. It is caused by an organism described by Rivolta as Saccharo- mycosis farciminosus. According to Pallin, it is found in large numbers in the diseased tissues, partly free and partly enclosed in pus corpuscles, which often contain ten to thirty or more of them. The period of incubation is place
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