170 THE INVISIBLE WORLD 



as yet been tried, for the most part, on soldiers. 

 Including all countries, not less than 150,000 have 

 already been inoculated. Among the vaccinated 

 typhoid has been reduced about 90 per cent. The 

 deaths still more. In comparatively few cases of 

 failure the fault may be owing to imperfect vac- 

 cination. When the vaccine is good, and the job 

 is skillfully and perfectly done, every case may be 

 a success. 



Probably, in the near future, not only among 

 soldiers, but in any neighborhood where a special 

 typhoid epidemic breaks out, the vaccine will be 

 generally used. 



Meanwhile, there should be no relaxation in 

 other modes of prevention. 



