l82 DISEASES OF SWINE 



Treatment. — Preventive treatment is the only suc- 

 cessful method of combating the kidney worm. 

 This is along the same lines as recommended for 

 intestinal worms. The turpentine treatment may 

 be of some benefit, as it is partially eliminated from 

 the body by the kidneys. However, it is hardly 

 probable that such treatment as this would prove 

 at all effective, even if a correct diagnosis was made. 



THE LUNG WORM 



Strongylus Paradoxus — Mehlis 



The lung worm of hogs is of greater economic 

 importance than is commonly believed. It is the 

 most common parasite of swine, and when the con- 

 ditions are favorable for its development, may be 

 present in the air passages in large numbers and 

 seriously interfere with the thriftiness of the pigs. 

 It is usually fojind in the small bronchial tubes 

 mixed with the mucus, which is secreted in abun- 

 dance by the irritated lining membrane. If the 

 infection is light, the parasite is generally over- 

 looked. In such cases if a piece of the lung is cut 

 oflE at the apex, and the tissue pressed between the 

 fingers, the worms present in the bronchi are forced 

 out and onto the cut surface. 



Description. — The lung worm has a thread-like 

 body, varying in length from three-quarters of an 

 inch to an inch and a half, and white or brownish 

 in color. The male is smaller than the female and 

 the tail is curved. 



Source of Infection. — The complete life history 



