VACCINES IN TREATMENT OF DISEASE 285 



ing-cough is less than half what it was when 

 treated with drugs. Vomiting, which is usually 

 such an annoying and serious symptom of 

 whooping-cough on account of its exhausting ef- 

 fect, is often quickly relieved by means of the 

 vaccine. Complications which have been so 

 common under the older methods of treatment 

 have been of rare occurrence under vaccine 

 treatment. The data that have already been 

 accumulated by numerous workers indicate 

 that the combined vaccine has a distinct value in 

 the treatment of whooping-cough, particularly 

 in the alleviation of symptoms and in shorten- 

 ing the course of the disease. 



PYORRHEA ALVEOLARIS 



Pyorrhea alveolaris is a purulent inflamma- 

 tion of the dental periosteum, with progressive 

 necrosis of the alveoli and loosening of the teeth. 

 The causative factor of pyorrhea alveolaris is 

 still a mooted question but the work of Bass and 

 Johns (The Journal A. M. A., Feb. 13, 1915, p. 

 553) indicates that an endameba is present. 

 Bacteriologic investigation reveals the constant 

 presence of the streptococcus or the pneumo- 

 coccus in pyorrheal infections. At times, other 



