40 HOG CHOLERA 



has a very offensive odor, and may be cloudy white 

 in appearance, or otherwise abnormal. 



As the disease progresses, emaciation is quite 

 rapid, and general weakness prevails. Frequently 

 a terminal pneumonia develops during the last 

 few hours, and death may result from heart or 

 respiratory failure. 



Chronic hog cholera occurs, for the most part, 

 among stragglers that survive the acute form, but 

 it may exist independently among semisusceptible 

 young pigs. Emaciation, cough, depraved appe- 

 tite, diarrhea, unsteady gait, drooping ears and 

 tail, tucked-up flank, and even sloughing of the 

 skin are among the symptoms that appear. Some 

 animals recover, but complete return to normal 

 health is not the rule. 



LESIONS 



Peracute hog cholera does not usually produce 

 characteristic macroscopic lesions, but congestion 

 of the lymph glands, mesenteric vessels and var- 

 ious parenchymatous organs may often be ob- 

 served. It is in the acute uncomplicated form 

 that the most typical lesions occur. These con- 

 sist of congestion, hemorrhages and degeneration, 

 hemorrhages being the only ones which, by virtue 

 of character or location, are highly characteristic 

 of the disease. These appear as petechiae in the 

 kidneys, serosa of the intestines, mucosae of the 



