CHAPTER XXIV. 



Typhoid Fever — Study of the Organism Concerned in its Production — 

 Its Morphological, Cultural, and Pathogenic Properties — Bacillus Coli 

 — Bacillus Paratyphosus — Its Resemblance to Bacillus Typhosus. 



BACILLUS TYPHOSUS. 



The organism seen in the cadavers of typhoid subjects 

 by Eberth (1880-81), and subsequently isolated in pure 

 culture and described by Gaffky (1884), is generally recog- 

 nized as the exciting factor of typhoid fever. It may be 

 described as follows: 



Fig. S4 



Fig. 85 





Bacillus typhosus, from cultures 

 twenty-four hours old, on agar-agar. 





Wr 



Bacillus typhosus, -showing 

 flagella stained by Loffler's 

 method. 



Morphology. — It is a bacillus about three times as long 



as broad, with rounded ends. It may appear at one time 



as \'ery short ovals, at another time as long threads, and 



both forms may occur together. Its breadth remains toler- 



31 (481) 



