84 - SWINE DISEASES 



disease varies from one to three or four months. The 

 diagnosis should be based upon the history of the out- 

 break, 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 location of the parasites and the difficulty of con- 

 trolling swine. The only rational method consists of 

 the intratracheal injections of some agent that will 

 destroy the parasites, or by the inhalation of medicated 

 vapors. These methods are not easily adapted to the 

 treatment of swine, particularly the intratracheal injec- 

 tions. Medicated vapors may be used, providing the 

 swine can be confined in an airtight 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. 



LUNGS 

 Atelectasis 



This is a condition of collapse of the lung; the 

 absence of air in the lung, and may be either congenital 

 or acquired. The lung of the fetus is always atelectic 

 before birth. This is one means of determining a still 

 birth, and is often useful as evidence in legal cases. 

 Partial congenital atelectasis may be the result of obstruc- 

 tion of a bronchus with meconium or mucus; it may also 

 be the result of excessive extrathoracic pressure. Acquired 

 atelectasis may be due to compression of the lung by 

 inflammatory exudate (pleuritic effusions), edema tous 

 transudate, or forward displacement of the diaphragm. 

 It may also be due to obstruction of the bronchus, the 



