44 IMMUNOLOGY 



young plasma cells full of very small rods that stain as if they 

 were viable. These are in contrast to larger rods found in the 

 ordinary phagocytes present in the immediate surroundings. In 

 Goodpasture's opinion tliese small rods as well as the large ones 

 are typhoid bacteria differing in size due perhaps to their environ- 

 ment. The small ones have made use of young plasma cells as 

 host cells. After liberation from the host cells they developed 

 into the larger rods found within macrophages. 



References 



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