MICRO-ORGANISMS IN VARIOUS DISEASES. 201 



(c) Entry: Respiratory channels ; normally present in 



almost everyone's mouth. 



(d) Exit: Sputum; in discharges when empyema 



(secondary to pneumonia) ruptures, or 

 is opened by operation; in complications, 

 otitis media, etc. 



(e) Contracted: Exposure to cold and wet; exposure 



to pneumonia while fatigued and depressed. 



(f) Disinfection: Easily destroyed by boiling; car- 



bolic acid 3-5 per cent, formalin 3-5 

 per cent, tricresol i per cent. Sulphur or 

 formaldehyde fumigation. 



(g) Prophylaxis: January, February, and March, 



are the coldest and most disagreable months 

 in the year and are on this account the 

 months in which the greatest number of 

 cases of pneumonia occur. Avoid wetting 

 and exposure, and especially after ''catch- 

 ing cold. " Intoxicated persons are partic- 

 ularly susceptible to pneumonia, as are 

 also infants, old people, and those debili- 

 tated by a chronic disease. Mental de- 

 pression is also a predisposing cause. 



Relapsing Fever ("Famine fever," seven-day fever, 

 etc.). 



(a) Cause: Spirochceta Obermeieri. 



(b) Localization: Blood. 



