. Cyclopedia of farm animals. Domestic animals; Animal products. INFECTIOUS DISEASES OF ANIMALS 135. Fig. 117. Section of tuberculous lung of a cow. The light colored points are areas of calcification; the remainder is the cheese-like tuberculous material. conditions : (1) The primary lesions may be found in any one of the organs or membranes. Its com- parative age is determined by the character of the anatomical changes. It may be entirely encysted, caseous or calcareous and dead. In addition to the primary focus, there may be a succession of tuber- cles of various ages distributed in one or
. Cyclopedia of farm animals. Domestic animals; Animal products. INFECTIOUS DISEASES OF ANIMALS 135. Fig. 117. Section of tuberculous lung of a cow. The light colored points are areas of calcification; the remainder is the cheese-like tuberculous material. conditions : (1) The primary lesions may be found in any one of the organs or membranes. Its com- parative age is determined by the character of the anatomical changes. It may be entirely encysted, caseous or calcareous and dead. In addition to the primary focus, there may be a succession of tuber- cles of various ages distributed in one or more organs. (2) The lesions may be restricted to one organ, as the liver, in which the primary focus has spread by continuity, due to its infiltrating nature, until the destruction of the tissues of the organ has become so extensive that death results. Such cases are not common. (3) The primary lesion may be well marked and accompanied by miliary tubercles sprinkled extensively throughout the organs and tissues of the entire body. (4) The lesions through- out the body may resemble each other very closely, so that difficulty may be experienced in determining the primary focus. When the primary infection is restricted to a single focus, the disease is said to be localized. When the specific bacteria are spread from the primary lesion through the agency of the lymph and blood streams, infecting other organs with the tubercle bacteria, each of which becomes the starting point for a new tubercle, the disease has become generalized. Tuberculosis in swine.—Tuberculosis in swine is often generalized. Swine are usually infected through the food. If pigs are fed on the refuse from dairies and cheese manufactories in districts where there is much tuberculosis in cattle, or on tuber- culous viscera, they readily become infected. In most cases, tuberculosis of the pig is first recognized at the abattoir ; sometimes, however, it causes local and general troubles, which vary according to t
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