314 SWINE PRACTICE 



tial to carefully consider the liistor_v and symptoms as well as lesions. 

 Hog cholera invariably has a sudden onset, a large percentage of a 

 herd being simultaneously affected, and anorexia is a prominent 

 symptom; whereas, infectious necrotic enteritis has a relatively slow 

 onset, and the affected animals have irregular appetites. If hog 

 cholera and infectious necrotic enteritis occur simultaneously the his- 

 tory and symptoms would typify hog cholera and it will be necessary 

 to identify the combination by the lesions revealed in autopsy which 

 would consist of petechial hemorrhages in the lung, subserous struc- 

 tures, kidney, bladder and spleen, and congestion of the skin and 

 hemorrhages in various lymph-glands which typify cholera as well 

 as the lesions of infectious necrotic enteritis in the intestinal mucosa 

 and peritoneum. 



Swine plague of the septicemic or pulmonary type is relatively 

 common and may occur independently or as a complication of infec- 

 tious necrotic enteritis. The septicemic form of swine plague has a 

 sudden onset and rapid course. Many animals are simultaneously 

 affected and the lesions consist of submucous and subserous hem- 

 orrhages, congestion of the skin and lymph-glands, and in some in- 

 stances there is pulmonary edsma. These clinical and postmortem 

 findings are sufficiently distinctive for the identification of this form 

 of swine plague. If the septicemic form of swine plague and infec- 

 tious necrotic enteritis occur simultaneously, the history and sym- 

 toms would characterize swine plague and the existence of inflam- 

 matory necrotic intestinal lesions would identify infectious necrotic 

 enteritis. The pulmonary form of swine plague is characterized by 

 cough and dyspnea in various degrees, sufficiently distinctive from 

 symptoms of infectious necrotic enteritis that diagnosis should not be 

 difficult. 



The simultaneous existence of the pulmonary form of swine plague 

 and infectious necrotic enteritis will evidence a combination of symp- 

 toms indicating involvement of the thoracic and abdominal organs, 

 but an autopsy will reveal an atypical catarrhal pneumonia in which 

 there is an interlobular infiltration and there may or may not be a 

 fibrinous pleurisy lesion typifying pulmonary swine plague, and in 

 addition there will be found intestinal lesions characterizing infec- 

 tious necrotic enteritis. 



Parasitic pneumonia occurring separately or as a complication of 

 infectious necrotic enteritis is sufficiently prevalent to be given con- 

 sideration in differential diagnosis. The uncomplicated cases are 



