LUNG WORMS 669 



ence of this worm is responsible for a large number of cases of 

 paralysis of the hind limbs and other diseases of the back. In past 

 years this worm was at one time given credit for being the cause 

 of hog-cholera. The large number of cases in which we have 

 cholera without this worm being present is ample proof that it has 

 Httle or nothing to do with the cause of the disease. In like man- 

 ner, numerous cases of paralysis of the hind parts which have been 

 examined postmortem fail to show any relation between this con- 

 dition and the kidney worm. 



In some few cases where the parasites invade the kidney in 

 large numbers they may produce considerable irritation of these 

 organs and set up an acute nephritis. Large abscesses may be 

 formed in exceptional cases in the region of the kidneys, and 

 these may produce considerable trouble and quite noticeable 

 symptoms. 



Treatment for this form of parasite is rarely called for, as it is 

 unusual for the worm to produce any noticeable symptoms of dis- 

 ease. Even in those cases that do show symptoms suggestive of 

 the presence of lard worms, it is practically impossible to reach 

 the parasite by any means of medication. Turpentine is about 

 the only drug that would seem to be of any value. This agent 

 is eliminated largely through the kidneys, and it may be possible 

 by its use to destroy any of the worms that are in the kidney. 



Preventive treatment of this parasite is about the same as in 

 the case of the intestinal worms. Cleanliness of feed lots and 

 exercise of hygienic rules in matter of feeding, to avoid contamina- 

 tion of the food and water with feces and urine from infested hogs, 

 is the main essential in prevention. 



LUNG WORMS (STRONGYLUS PARADOXUS) 

 Lung worms are very common parasites of the hog in the 

 United States, and are deserving of much more importance and 

 attention than is usually attached to them. In meat inspection 

 work this parasite is one of the most commonly found of all the 

 parasites of the hog. It locates itself in the bronchial tubes and 

 in the lungs, where it lodges in the finer bronchial capillaries. 

 Its presence during life may often be unnoticed, but in small pigs, 

 when the strongylus occurs in large numbers, they are bound to 



