540 APPLICATION OF METHODS OF BACTERIOLOGY 



the organisms varies with the different strains. The more 

 closely a member of the group resembles culturally the 

 organism employed in immunizing the animal the more 

 readily is it agglutinated. In attempts to diagnose para- 

 typhoid infection it is well to bear this fact in mind and make 

 agglutination tests upon different members of the group 

 with the blood of the patient. 



