Disease Transmission and Mans Resistance 



311 



The peculiar dissolving properties of this agent have since been 

 called the "Twort-d'Herelle Phenomenon." 



Phage resembles viruses in size ( range of from 10 to 75 milli- 

 microns), in requiring a living host cell for growth, in its extreme 

 specificity, and in other properties. 





Fig. 52. Photomicrograph of pus showing phagocytosis of diplococci 

 by white blood cells. (From Microbiology, W. B. Sarles, W. C. Frazier, 

 J. B. Wilson, and S. D. Knight. Copyright 1951, Harper and Brothers, 

 New York.) 



It was d'Herelle's belief that as soon as bacteriophage had been 

 sufficiently activated within the animal body, the virus could de- 

 stroy the bacteria for which they were specific, and the patient re- 

 covered. The accuracy of this theory has never been sub- 

 stantiated. 



