DISEASES OP RESPIRATORY ORGANS 



155 



chitis, evidenced by fibrous proliferation around the bronchial tubes, 

 which may extend into the pulmonary tissue. 



Symptoms. — The principal symptom of bronchitis is a cough which 

 in the beginning is dry but later becomes moist. The cough may 

 become convulsive. As the disease progresses a nasal discharge be- 

 comes evident, which is at first of the nature of mucus but later 

 becomes mucopurulent or purulent. Rales may be detected in thin 

 swine, or possibly in any of the bacon breeds, but the chest wall of 

 other swine is usually so thick that it practically prohibits the recog- 

 nition of pulmonary conditions. There is usually some rise of tem- 

 perature in the beginning, but this may subside. The appetite may 

 be diminished. 



Treatment. — Removing the cause and providing sanitary surround- 



Lung worms 

 in a bronchial 

 tube 



Fig. 29. Bronchial tube of hog with lung worms. (Ostertag.) 



ings will probably do more than medication to relieve this condition. 

 Supply easily digested foods. If the swine can be controlled easily 

 and placed in a piggery that can be made practically airtight, the 

 animals may be successfully treated with medicated vapors, using 

 such agents as oil of eucalyptus. • ... . 



