CHAPTER XXXIV. 
COMMON DISEASES OF SWINE. 
110G CHOLERA (SWINE FEVER). 
Tus highly infectious disease is due to a germ, and causes 
a loss of many millions of dollars annually in the United States. 
It causes an inflammation and ulceration of the stomach and 
intestines, enlargement and inflammation of the lymphatic 
glands, and various other disturbances. The most characteristic 
lesions of the disease are inflamed areas on the lining mem- 
brane of the intestines and stomach, which eventually change 
into raised ulcers, circular in outline. (Figs 90 and 91.) 
Symptoms.—The hog usually goes off by itself and lics 
in a cool place. The back is arched, the hind parts appear 
stiff, causing the hog to stagger and cross the hind legs as it 
walks, There is a watery secretion from the eyelids, which later 
becomes thicker in character, causing the lids to adhere. Owing 
to increased secretions from the skin, dirt adheres to it, giving 
the animal a dirty appearance. Alternate diarrhcea and con- 
stipation is common, and the diarrheal discharge is thin and 
watery, and sometimes mixed with blood. (Fig. 92. ) 
Acute cases usually terminate in death in from two days to 
two weeks, but sometimes death occurs before the symptoms 
become well marked. 
In the subacute or mild form, the symptoms may escape 
notice, but there is usually a slight fever, with loss of appetite, 
constipation, and diarrhea. The pig generally recovers in a 
few days. 
The disease is said to be chronic when it lasts for a con- 
(327) 
