THE CONQUEST OF DISEASE 



Bacteria 

 carriers. 



Tubercu- 

 losis. 



the fly loaded with typhoid bacilli, where they 

 are known to have remained alive for a period 

 of two weeks. Much of that disease in military 

 camps has been traced to this agency of dis- 

 semination. The story of : 'the fly that does 

 not wipe its feet" before alighting upon our 

 food has interest for all of us. It is true that 

 typhoid does travel with the wind because the 

 wind carries this little animal, as the studies of 

 Anderson and Dutton have shown. 



Certain persons after apparently recovering 

 from infective diseases continue to harbor in 

 their bodies the infective organisms and un- 

 knowingly to disseminate the disease. These 

 persons are called "bacteria carriers" and are 

 a great menace. Typhoid fever, dysentery, 

 bubonic plague and diphtheria are transmitted 

 in this way. Typhoid bacilli have been carried 

 about and the disease transmitted by individ- 

 uals who have been for several years appar- 

 ently well. Animal experimentation is used 

 to discover the infective organisms in these 

 people, and vaccination against typhoid prom- 

 ises to render their bodies uninhabitable for the 

 typhoid bacillus. 



Tuberculosis was once thought to be a vague 

 consumption of the body through some peculiar 



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