. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 192 TUBERCULOSIS encysted, caseous or calcareous and dead. In addition to the primary focus, there may be a succession of tubercles of vari- ous 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 ot the organ has become so extensive that death results. Such cases do not seem to be co
. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 192 TUBERCULOSIS encysted, caseous or calcareous and dead. In addition to the primary focus, there may be a succession of tubercles of vari- ous 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 ot the organ has become so extensive that death results. Such cases do not seem to be common. 3. The primary lesion may be well marked and accompanied by miliary tubercles sprinkled ex- tensively throughout the organs and tissues of the entire body. 4. The lesions throughout the body may resemble each other very closely, so that difficulty may be experienced in determin- ing the primary focus. In the lungs, two distinct forms of lesions are observed, (i) The air cells may be infiltrated with the tuberculous mass spread- ing directly from the primary focus. This may be purulent, caseous or calcareous. The color may be , gray or of a yel- lowish tinge. (2) The lesions may consist of miliary tubercles. In later stages these nodules, more or less translucent, may be- come yellowish, caseated and Fig. 37. Tubcrcui ,^ :u calcareous in their centers. Large. lung showing areas oJ\ {a) casea- tubercular nodules are frequently Hon, (b) calcification, and [c) liquefaction. formed by the massing of several of these minute tubercles. When the lungs are primarily attacked the caudal (prin- cipal) lobes are most frequently involved. Smith considers. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Moore, Veranus A. (Veranus Alva), 1859-1931. Ithaca, N. Y. , Taylor & Carpenter
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