DISEASES OF RESPIRATORY ORGANS 157 



is usually limited and fatalities from this disease are exceptional. 

 The primary symptom is a cough, which usually involves several 

 animals at once and becomes more frequent as the disease progresses. 

 In fatal or severe cases the cough is paroxysmal, the animals some- 

 times falling to the ground from exhaustion and lack of air. A sticky, 

 adhesive discharge prevails and accumulates upon the nostrils, respira- 

 tion becomes difficult, and- a distinct wheezing sound can be heard. 

 The temperatiire may be increased from one to three degrees Fahren- 

 heit. Emaciation is rapid. Edema of the dependent parts occurs, 

 and the animals become weak and finally die of exhaustion. The 

 course of the disease varies from one to three or four months. The 

 diagnosis should be based upon the history of the outbreak, the 

 number of animals involved, the character of the cough, and finally 

 upon the detection of ova and parasites in the discharges and the 

 presence of parasites in the lungs on autopsy. 



Treatment. — This disease is difficult to treat because of the loca- 

 tion of the parasites and the difficulty of controlling swine. The 

 only rational method consists of the intratracheal injection of some 

 agent that will destroy the parasites, or of the inhalation of medi- 

 cated vapors. These methods are not easily adapted to the treat- 

 ment of swine, particularly the intratracheal injections. Medicated 

 vapors may be used, providing the swine can be confined in an air- 

 tight room. 



Further infestation should be prevented by the proper disposal of 

 the various excretions from the infested animals. The pens should 

 be thoroughly cleaned and some' efficient parasiticide applied. If the 

 infestation is in pasture land, it will be necessary to change pasture, 

 keeping all swine away from the known infested pasture for at least 

 a year, and for two years if possible. 



The exact procedure of medicating by inhalation will depend upon 

 the available facilities. The medicaments available are phenol, creo- 

 sote, various coal tar derivatives, turpentine, oil of eucalyptus, etc. 

 Hogs may be medicated by vapors during the winter months by 

 first removing all litter from the hog house or box stall in the horse 

 or cattle barn, bedding six or eight inches deep with clean hay or 

 straw. The medicament is then added to a sufficient quantity of 

 hot water (six or eight gallons), and the mixture then sprayed over 

 the fresh bedding and the hogs driven in at once, and they will 

 inhale a sufficient quantity of the vapors to be of considerable bene- 



