CHAPTER IX 



TYPHOID FEVER AND ITS RELATIVES 



^YPHOID fever is one of the serious and 

 common diseases, occurring among all 

 classes of people, which is definitely known 

 to be induced by bacteria. The germs of 

 this disease are little rods or bacilli considera- 

 bly larger than those which cause tubercu- 

 losis (Fig. n). 



There are several forms of low fever, and 

 some other diseases due to various causes, 

 which considerably resemble typhoid fever, 

 and are not infrequently mistaken for it. 

 But genuine typhoid fever is caused by this 

 particular germ, and no other, and is never 

 induced in any other way. The lower animals 

 do not have typhoid fever. 



The typhoid bacillus is not known to grow 

 outside the body to any considerable extent 



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