HOG-CHOLERA 



275 



yards and houses that are crowded, unsanitary, and in continuous 

 use, or when the hogs drink from wallows, ponds and creeks. 



Infections pneumonia or swine plague is probably due to 

 insanitary quarters. The symptoms and tissue changes some- 

 times closely resemble those met with in hog-cholera. 



Lesions. — In acute hog-cholera the inflammation is hemor- 

 rhagic in character. Small, red spots and blotches occur in 

 different organs and tissues. In the chronic form of the disease 

 ulceration of the intestinal and gastric mucous membrane, in- 



FiG. 81. — Kidneys from hog that died of acute 

 hog-cholera. 



Fig. 82. 



-Lungs from hog that died of 

 acute hog-cholera. 



flammation of the lungs and pleura and sloughing of the skin 

 are common lesions. 



The shin over the under side of the neck, body and inside of 

 the thighs may appear red or purplish-red in color. The different 

 groups of lymphatic glands are enlarged and softened. They 

 may vary in color from a grayish-red to a deep red, depending 

 on the degree of engorgement with blood. The pleura and peri- 

 cardium may show small red spots and blotches. The Tcidneijs are 

 usually lighter colored than normal, and marked with red spots 

 and blotches (Fig. 81). The spleen may show no evidence of 

 disease. It may be hemorrhagic, or even smaller than normal. 

 The liver mav be enlarged and dark, or mottled and light colored. 



