ANTI-TYPHOID VACCINE. 



has not been a single case of typhoid fever 

 among the vaccinated, while among the un- 

 vaccinated there were some two hundred (200) 

 cases in the same period. 



From various hospitals throughout the 

 United States and Canada come reports of 

 favorable results obtained by the use of the 

 method in the hospital' and outside among 

 physicians and nurses in order to produce 

 immunity. "Typhoid carriers" have also been 

 successfully treated. There have been no bad 

 results and very few severe reactions; even 

 these have entirely disappeared within forty- 

 eight hours or less. 



The object sought in anti-typhoid vaccina- 

 tion is to produce within the human organism 

 substances which are antagonistic to the 

 bacillus typhosus and which will destroy it. 

 By this means the person treated is brought 

 into a condition similar to that of a patient 

 who has recovered from the actual disease. 



The Anti-typhoid Vaccine is prepared from 

 a typical typhoid culture which is grown on 

 agar slants for twenty-four hours and is then 

 washed off into a small portion of saline 

 solution. It is tested for purity, placed in 

 tubes, sealed (one- fourth of one per cent of 

 tricresol is added as a safeguard), and the bac- 

 teria killed by heat at 60 centigrade for one 

 hour. 



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