Method of Making the Vaccine 269 



is called sensitization. This they accomplish by treating the 

 bacteria to be used with an antiserum, prepared by injecting 

 animals with such organisms as form the vaccine. In this manner 

 the specific bacteriolytic amboceptors are supposed to anchor 

 themselves to the bacterial cells, and so pave the way for 

 immediate destructive treatment in the body. To achieve such 

 sensitization, some of the appropriate serum is added to the 

 bacterial suspension which need not be subsequently killed, as 

 the sensitized bacteria meet with prompt destruction through 

 the normal complement of the body juices. However, if the 

 bacteria are first killed by heat and then sensitized, a similar 

 result may be brought about, and one is relieved of all anxiety as to 

 the possibility of infection accidentally resulting from the injections. 



