348 



INFECTIVE DISEASES. 



lungs are simultaneously affected are not numerous, and sometimes 

 the lungs may be found to be perfectly healthy in cases with 



PIG. 137. ULCERATION OF THE INTESTINE IN A TYPICAL CASE OF SWINE-FEVER. 



long-standing lesion of the intestine. Old pigs may linger on for 

 weeks, and ultimately recover, and in the meantime act as centres 

 for the dissemination of the disease. 



