3NFBCT10US DISEASES 



305 



and may be heiiiorrliagic l)ut there iw no peripheral hemorrhage. The 

 spleen may or maj- not be enlarged. This form of tlie disease is fre- 

 quently associated with disturbances caused by the B. snipestifer, 

 colon bacillus, Bacillus typhosus and Bacillus enteritid's, but it is 

 probable that the B. suisepticus is the primary disturbing factor. 



It is possible that a cerebral form of this disease may exist. 



Swine plague is frequently associated with hog cholera, and the 

 various ksions characterizing that disease will then be present also, 

 all of the lesions being variously modified. 



Symptoms. — The period of incubation, at least in artifically in- 

 fected cases, is of short duration, rarely exceeding two days. The 

 R€pticemic type is ushered in suddenly with a high temperature, 



Fig. 86. Pulmonary mixed Infection, catarrhal pneumonia. 



though it rarely exceeds 105 degrees Fahrenheit, accompanied by in- 

 appetence, weakness, and little tendency to move. The blush of the 

 skin due to hyperemia may be observed. This form is rapidly fatal, 

 the course rarely exceeding twelve hours. 



The pulmonary form of swine plague is evidenced by the usual 

 symptoms of pneumonia, such as short, dry, spasmodic cough, dys- 

 pnea, temperature up to 105 degrees Fahrenheit, a disposition on the 

 part of the affected animals frequently to sit on their haunches like 

 a dog, mucous or mucopurulent nasal discharge, diminished appetite 

 and finally cessation of appetite, and usually constipation. As the 

 disease progresses, breathing becomes more difficult and there is ex- 



