COMPLICATIONS 29 



The lesions produced in swine experimentally 

 infected by means of intravenous injections of 

 material containing B. pyocyaneus are those char- 

 acteristic of septicemia, congestion and dark col- 

 oration of the lymph glands, lungs, kidneys and 

 other organs appearing regularly. We have ob- 

 served no such effects where natural infection 

 rules. Here the constant lesion produced is pneu- 

 monia, acute or chronic, and the constant symp- 

 toms that appear are those that may be referred 

 to this condition. 



Dyspnea, abdominal breathing and other 

 marked evidence of respiratory distress charac- 

 terize the disease. Paroxysms of coughing occur 

 when the hog is required to move, the alae of the 

 nostrils are drawn backward, giving the snout a 

 peculiar pointed appearance, and it is not uncom- 

 mon for the affected animals to assume a dog- 

 sitting position, with the forelegs placed widely 

 apart. Thumping appears frequently. Some- 

 times there is a yellowish purulent discharge from 

 the nostrils. The appetite may or may not be 

 affected, while the temperature, as a rule, remains 

 normal or is only slightly elevated. 



The typical lesion which we have found associ- 

 ated with natural infection due to B. pyocyaneus 

 consists of a semi-chronic type of bronchopneu- 

 monia, affecting first the ventral and cephalic 

 portions of the lungs, or if lung worms are pres- 



