THE EHRLICH DIAZO REACTION 



339 



quite possible that the diazo was present and disappeared before enter- 

 ing the hospital. The third case gave a positive Widal reaction, but 

 was an unusually mild attack. With the exception of the case just 

 mentioned, all of our cases of undoubted typhoid fever that entered 

 the hospital sufficiently early gave the diazo reaction. 



In this series of cases the following sequels were met with: 

 Phlebitis, two; abcess, three; pneumonia, one; hemorrhage from bowel, 

 one. None of these sequels were heralded or accompanied by a diazo 

 reaction. In two cases there were relapses with a reappearance of 

 the diazo. The reappearance of the diazo points more to a relapse 

 than the occurrence of a complication, according to the iindings in 

 our series of cases. Riitimeyer states that in relapses we almost 

 always get a renewed reaction if the reaction has disappeared before 

 the relapses occur. Michaelis affirms that the reappearance of the 



(1) ("Also tuberculosis") refers only to the case in which diazo was present; the same is true 

 of ("also of heart disease"). 



