148 TUBERCULOSIS IN SWINE 



discharges a small quantity of thick and grumous pus ; but the 

 glandular tumor does not disappear and the opening into the 

 abscess remains for a long time as a fistula. 



At the same time one may notice swellings of the bones, 

 causing a true tuberculous arthritis when the lesions happen 

 to be situated at the level of an epiphysis. Persistent lame- 

 ness, fistulous wounds suppurating indefinitely, necrosis, 

 caries, etc., are the compHcations of the lesions of the bone, 

 the development of which is always extremely slow. 



§ 114. Morbid anatomy. The manifestations of tuber- 

 culosis in swine, as suggested in the foregoing statement, are 

 exceedingly interesting. Nocard finds the lesions to consist 

 of miliary granulations which rapidly become caseous, as in 

 cattle, but which more rarely contain calcareous salts. Gene- 

 ralization is common, in which case the viscera are thickly 

 sprinkled with gray granulations which are translucent 

 throughout, or opaque in their centers, and quite analogous to 

 those found in tubercular lesions in other animals. 



As the disease most often results from ingestion of the 

 virus, the digestive apparatus and the corresponding lymphatic 

 glands (submaxillary, parotid, pharyngeal, superior cervical, 

 mesenteric, sublumbar, etc. ) may be decidedly altered, while 

 the other organs remain practically intact. Lesions of the 

 small intestine and the caecum are common and take the form 

 of ulcers of the mucous membrane, of miliary nodules or of 

 tuberculous infiltrations involving at once the mucous, the 

 muscular, and subserous tissues. The lesions in the liver take 

 the form either of miliary granulations, which are yellow and 

 caseous and scattered in great numbers through the thickness 

 of the organ, or else of rounded nodules which are yellowish 

 white in color, varying in size from that of a pea to a hazel 

 nut, and of a tough consistency. On section they appear some- 

 times to be firm, homogeneous and fibrous ; sometimes soft- 

 ened in the center, but rarely infiltrated with calcareous salts. 

 The peritoneum and the pleura are sometimes the seat of an 

 eruption of fine granulations which remain in a state of miliary 

 nodules. Lesions like those in the liver may exist in the lungs, 

 but generally there is found in these organs an innumerable 



