408 PATHOGENIC BACTERIA. 



Sanarelli's labors have not ceased with his careful study 

 of the Bacillus icteroides, but have been carried into the 

 important field of serum-therapy. By careful manipula- 

 tion he has succeeded in immunizing the horse and ox to 

 large doses of the bacillus, injecting into a vein so as to 

 prevent the intense local reaction, and has found that the 

 serum of these animals has the power to protect guinea- 

 pigs from lethal doses of the bacillus. He hopes that 

 the serum will also be efficacious in the treatment of yel- 

 low fever in the human being. 



