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SWINE PRACTICE 



treme weakness and emaciation if the affected animals live long 

 enough. The blush of the skin is usually present and there may be 

 conjunctivitis. The acute form usually terminates fatally in about 

 one week, but more rarely the disease becomes chronic. 



The subacute or chronic pulmonary form is evidenced by spasmodic 

 cough, temperature of about 104 degrees Fahrenheit, poor appetite, 

 emaciation, and weakness, the animals usually dying of exhaustion 

 in from four to eight weeks. 



The intestinal form of this disease is evidenced by digestive de- 

 rangement. There is usually diarrhea which persists and the animal 

 emaciates rapidly and becomes weakened and dies in from a few 

 days to perhaps two weeks after the onset. During practically the 

 entire course of the disease the appetite remains good. This par- 



Fig. 87. A group of pigs taken from a herd in which could be found 

 symptoms of various diseases. The two pigs at the left (X) show symptoms 

 of cholera. Autopsy showed lesions of cholera predominating, while autopsy 

 of the pig in the center (0) showed well marked lesions of necrotic en- 

 teritis, i i' _ i :J ^! 



ticular type of the disease in some localities is designated as the 

 drying-up disease. * 



Diagnosis. — The diagnosis of swine plague is attended with con- 

 siderable difficulty. The septicemic form can be distinguished from 

 the uncomplicated septicemic form of hog cholera only by the dem- 

 onstration in the blood of the Bacillus suisepticus and the presence 

 of hog cholera virus by the production of hog cholera by inoculation 

 with the filtered blood. 



From the pneumonia of hog cholera the pulmonary form of swine 

 plague is differentiated only by autopsy. The lung lesions in hog 



