2o8 INFECTIOUS AND PARASITIC DISEASES. 



dressings, need be disinfected. See an- 

 thrax (p. 185). 

 (g) Prophylaxis: Consists in thorough opening and 

 cleansing of all wounds which have been 

 soiled with earth, or resulted from Fourth 

 of July celebrations; or in which foreign 

 body is imbedded in flesh. Where tet- 

 anus is feared, the wound should not be 

 sealed with dressings, but left exposed to 

 the air; tetanus antitoxin should he used. 



Tuberculosis. 



(a) Cause: Bacillus tuberculosis (Koch bacillus); 



non-sporogenous, but exhibits greater resist- 

 ance to destructive agencies than vegetative 

 forms of other bacteria. 



(b) Localized: Practically everywhere; lungs (phthi- 



sis, consumption) ; lymph glands (scrofula) ; 

 bones, abdominal viscera; brain, etc. 



(c) Entry: Chiefly by air-passages, and by mouth 



with food and drink; also through wound 

 of skin and mucous membranes. 



(d) Exit: In all discharges from diseased tissues or 



organs. As lungs most frequently are 

 the seat of the disease, the sputum is the 

 most common vehicle of discharge. 



(e) Contracted: Usually by inhalation where pro- 



longed contact with consumptive ; probable 



