. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 115. A drawing of tuberc'e bacilli. of its course vary largely according to the loca- tion of the lesions. When they are situated deeply and are not of great extent, they may not exhibit visible evidence of their presence. In such cases, the infected animal may present the picture of perfect health and show no disturbance of func- tion. Some animals are slaughtered for beef with- out a suspicion of the presence of tuberculosis. Fig. 116. Tubercular nodules on the pleura of the chest wall of a cow. until they are examined pos
. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 115. A drawing of tuberc'e bacilli. of its course vary largely according to the loca- tion of the lesions. When they are situated deeply and are not of great extent, they may not exhibit visible evidence of their presence. In such cases, the infected animal may present the picture of perfect health and show no disturbance of func- tion. Some animals are slaughtered for beef with- out a suspicion of the presence of tuberculosis. Fig. 116. Tubercular nodules on the pleura of the chest wall of a cow. until they are examined post-mortem. There are no distinctive symptoms but a cough, rough coat, tight, harsh skin, loud respiratory sounds; and enlargement of the glands in the neck, in the groin or above the udder are very suspicious. The symptoms of acute miliary tuberculosis, " galloping consumption," are rapid loss of flesh, depression, poor appetite, cough, weakness, rapid breathing, harsh respiratory sounds, some eleva- tion in temperature, increased pulse rate and, sometimes, enlarged lymphatic glands. The course of this form of tuberculosis is always rapid and terminates in death. It occurs when large num- bers of tubercle bacteria are discharged into the blood or lymph currents. They are then carried to other parts of the body, filtered out in the capil- laries of the lungs, liver, spleen, kidneys and else- where, causing tubercular lesions in each of these localities (Fig. 116). The lesion from which the infectious material entered the circulation may have been a comparatively small nodule. This form of the disease is more likely to appear in young animals than in adults, and is more com- mon among swine than in cattle. The usual direct anatomical changes following the invasion of tubercle bacteria are the formation of nodules or tubercles. A tubercle is "a small nonvascular nodule composed of cells, varying in form and size, with some basement substance between them, and with an
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