llOCi-CHOLERA 273 



by the person in cliargc of the herd. The hoa' may show a dis- 

 position to eat dirt. The sick hog- is nsnally found lying in its 

 hed, or oli" by itself in a quiet place. It presents a rather charac- 

 l eristic ^appearance. The hack is arched, the hind feet are held 

 close together, or crossed, the abdomen is tucked up and the hog 

 appears weak in its hind parts. Diarrhaa or constipaiion may 

 be present. The color of the diarrhceal discharges varies accord- 

 ing to the character of the feed, and it may be more or less tinged 

 with blood and have a disagreeable odor. The urine is highly 

 colored. 



The respirations and pulse heats are quickened and abnormal 

 in character. Thumps sometimes occur. When the mucous 

 membranes lining the throat and anterior air passages are thick- 

 ened, the respirations are noisy and difficult. The animal may 

 cough on getting up from its bed and moving about. There is at 

 times a noticeable discharge from the nostrils. When the Jungs 

 are inflamed the respirations are quickened and labored. In 

 case the pleural membrane is inflamed, the respiratory symptoms 

 are more severe, and the hog shows evidence of pain when the 

 walls of the chest are pressed on. The pericardium may be in- 

 flamed. In such eases the hog staggers and falls when forced 

 to walk. 



The central nervous system may be involved by the inflamma- 

 tion. The usual symptoms occurring in inflannnation of the 

 brain and its coverings are then present. A sleepy, comatose 

 condition may end in death, or the animal dies in a com^ilsion. 



The secretions of the skin and mucous membranes are 

 al )normal. The skin in the regions of the ears, inside of the thighs 

 and under surface of the body is moist, dirty or discolored red. 

 Just before death the skin over the under surface of the body be- 

 comes a purplish red. In the chronic form, a dirty, thickened, 

 wrinkled skin is commonly observed. At first the secretion from 

 the eyes is thin and watery, but it becomes thick, heavy and i)us- 

 like, causing the margins of the lids to adhere to each other. 

 18 



