THE CONQUEST OF DISEASE 



officers who are carrying on these experiments 

 are men who are experimenting upon them- 

 selves. Such animal experimentation is now 

 being made by Dr. Harrison, of the Royal 

 Army Medical College, who is working out a 

 plan for the internal administration of typhoid 

 vaccines. In the United States Army a medi- 

 cal board has strongly recommended antity- 

 phoid vaccinations, and vaccination is now 

 offered to those who desire it. Already 2000 

 soldiers have voluntarily received inoculation. 



/ 



The German Army has adopted the same means 

 of prophylaxis, and is pushing it vigorously. 

 The results secured by this method are 

 steadily growing better as the technic is im- 

 proved. At present the results which are being 

 attained indicate that the inoculation with 

 antityphoid vaccine is capable of reducing the 

 mortality of typhoid fever one hundred times. 

 In general, for one case of typhoid among the 

 inoculated there are ten among the uninocu- 

 lated ; and for one death among the inoculated 

 who contract typhoid there are ten among the 

 uninoculated who contract typhoid. In other 

 words, the uninoculated are ten times more apt 

 to contract the disease, and it is ten times more 

 apt to be fatal when they contract it, than is 



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