BACILLUS PARATYPHOSUS. 463 



with one of the organisms varies with the different 

 organisms. The more closely a member of the group 

 resembles culturally the organism employed in immuni- 

 zing the animal the more readily is it agglutinated. In 

 attempts to diagnose paratyphoid infection it is well to 

 bear this fact in mind and make agglutination tests with 

 different members of the group and the blood of the 

 patient. 



