122 THE ACUTE SELF-LIMITED INFECTIONS 



with glasses and eating utensils. The mouth should be 

 washed or wiped with boric acid solution frequently. 

 A dish of bichloride, 1 to 2000, should be convenient, 

 so that the nurse or visitor may cleanse the hands 

 frequently. 



The typhoid bacillus is an organism exerting its 

 noxious power by means of poisons contained in its 

 body and liberated upon its disintegration. These 





FIG. 34.- Microscopic field, showing the top of a hanging drop in a 

 normal typhoid culture. (Park.) 



endocellular poisons are capable of calling forth a 

 reaction upon the part of the body which results in 

 some antibody formation. Second attacks of typhoid 

 are rare and the reason is probably that a sort of 

 active immunity is gained by one attack. As a matter 

 of fact, it can be shown by laboratory methods that 

 blood after typhoid fever has more power to destroy 

 the bacilli than before the attack; that is, it has 



