INFECTIOUS DISEASES 



179 



Pectoral form. This type consists of the hemorrhagic 

 form in varying degrees of intensity and pulmonary 

 lesions which may or may not be associated with pleurisy. 

 As previously stated, croupous pneumonia commonly 

 occurs in the septicemic form, but it is more extensive in 

 the pectoral form. 



/C 



B 



Fig. 12. MUCOUS MEMBRANE OF THE INTESTINE. 

 A. Normal. B. showing; effect of chronic inflammation due to hog: 

 cholera. C. typical hog cholera ulcers. 



The usual pulmonary lesion consists of croupous pneu- 

 monia involving especially the cardiac lobe of the lung. 

 The appearance of the lung will depend upon the stage of 

 pneumonia existing at the time of death of the animal. 

 The affected portion may be in the congestive, red, or 

 gray hepatization or resolution stage, and occasionally 

 there may be abscess formation or necrosis. More 



