96 



FISTULA AND POLL-EVIL 



ers is by far the best example we have in 

 domestic animal pathology. Its symptoms are 

 seen in the unthrifty and enfeebled state of 

 the patient and in its susceptibility to other 

 diseases, particularly to new infections after 





Fig. 11. — A Complicated Case of Fistula and Poll-Evil. 



operations, and to pneumonia — the common 

 form of dissolution of so many diseases. 



Pneumonia 



The pneumonia arising as a complication of 

 fistula of the withers occurs chiefly in old debil- 

 itated subjects or in younger animals reduced 

 to a state of general enf eeblement from neglect 

 and exposure. It is sometimes also metastatic- 

 abscess of the lungs — the infection is carried 

 ^from the purulent hot bed to the pulmonary 



