INFECTIOUS DISEASES 285 



wabbling gait, are gaunt in appearance, refuse all food and usually 

 die in from two to seven days. An occasional case recovers after 

 being ill for several days. In such cases it is not uncommon for 

 areas of skin or even the ears to slough, leaving ragged ugly wounds 

 that heal very slowly. Such recovered hogs are permanently immune 

 to hog cholera. In some instances the first manifestation of the 

 disease is lameness, the disease sometimes being diagnosed as rheu- 

 matism. 



In complicated cases the symptoms will vary according to the nature 

 of the complication. When hog cholera is associated with necrotic 

 enteritis the principal symptoms of uncomplicated cholera will be 

 observed in addition to marked digestive derangements. There will 

 be rise of temperature, impaired appetite, anorexia, vomition, diarrhea 

 without the initial constipation, weakness, gauntness, and death. 

 Cutaneous erythema may or may not occur; the ears usually become 

 swollen and there may be sloughing of the ears, or portions of the 

 skin; purulent conjunctivitis is usually present. 



Hog cholera may be associated with pneumonia. These cases are 

 manifested by the symptoms of hog cholera and disturbances of 

 respiration, such as cough, nasal discharge and dyspnea, the intensity 

 of the pneumonic symptoms depending upon the extent of the lung 

 involved in the pneumonic process. The course of hog cholera com- 

 plicated with pneumonia is relatively short and usually fatal. 



Swine plague is frequently associated with hog cholera. The sep- 

 ticemic form of swine plague is manifested by symptoms very similar 

 to those evidenced in cholera, and when this form of swine plague 

 occurs as a complication of hog cholera it is not possible to recognize 

 the existence of the two diseases. Swine affected with the combination 

 of the septicemic form of swine plague and hog cholera evidence an 

 extremely high temperature, anorexia and marked depression, and 

 death occurs within a few hours after the onset. The pulmonary form 

 of swine plague is the usual type of this disease that occurs as a com- 

 plication of hog cholera and the symptoms manifested are practically 

 the same as described in the pneumonic complication of hog cholera. 



In some cases there is a combination of hog cholera, necrotic enter- 

 itis and the pulmonary form of swine plague or pneumonia. The 

 symptoms manifested by such a combination of diseases will vary 

 according to the intensity of each of the diseases. There will be high 

 temperature, general lassitude, reluctance to move, arched back, de- 

 pressed head, impaired appetite or inappetence, vomition, diarrhea, 



