VACCINES IN PROPHYLAXIS OF DISEASE 217 



Practical Application Active immunization 

 of the community, in the face of an epidemic, is 

 a valuable addition to our preventive measures 

 against plague. It is of first importance as a 

 protective measure in small communities, on 

 shipboard, in camps, barracks, at quarantine 

 stations, at plague laboratories, among rat bri- 

 gades, as well as for physicians, nurses and 

 others who are exposed. The active immunity 

 produced by vaccination with Haffkine's pro- 

 phylactic lasts from one to six months. 



Results During an epidemic in the Punjab, 

 about one-third of the population of fifty vil- 

 lages was inoculated, the mortality being 16.9 

 per cent as compared to 45.2 per cent in those 

 not inoculated. According to Kolmer, mor- 

 tality among the inoculated is much lower, being 

 11 per cent to 41 per cent as compared with 50 

 per cent to 92 per cent among the non-immu- 

 nized. 



