I90 INFECTIOUS AND PARASITIC DISEASES. 



amount with milk of lime; treat bed-linen, 

 etc., same as in typhoid; fumigation not 

 necessary if appropriate sick-room precau- 

 tions are taken. 



(g) Prophylaxis: When cholera prevails, do not eat 

 any fruits or vegetables rav^; boil all 

 water, whether used for drinking purposes 

 or for washing of utensils; cook all foods 

 well, and leave nothing exposed to the air, 

 best to serve everything hot ; protect sick- 

 room, and all houses from flies, and keep 

 free from insects. If these precautions 

 are followed, one can live in a cholera 

 infected town and nurse cholera patients 

 without danger of contracting the disease. 



Dengue (break-bone fever, dandy fever). 



(a) Cause: Unknown. 



(b) Entry and Exit: Not known. 



(c) Disinfection: Not practised, since as far as 



known it never proves fatal. 



Diphtheria. 



(a) Cause: Bacillus diphtherice (Klebs-Loeffler bac- 



illus). 



(b) Localization: All mucous membranes, usually 



tonsils, pharynx, and anterior and pos- 

 terior nares; occurs in larynx, when it is 

 called membranous croup; sometimes seen 

 on the vulva; may infect wounds. 



