PATHOGENIC BACTERIA. 327 



in length. The ends are pointed. It is actively motile. 

 The spirillum is not stained by Gram's method but may be 

 colored by the ordinary aniline dyes. The organism has 

 never been cultivated. It is found abundantly in the blood 



FIG. 95. 



Spirillum of Relapsing Fever in the Blood. Sketched from a Stained 



Specimen. 



and in the spleen during the attack of fever. The spleen 

 is enlarged. The disease has been produced in apes by 

 inoculating them with blood taken from men having the 

 disease. 



It is asserted that the spirillum is transferred by bed- 

 bugs from one person to another. 1 



1 Karlinski, Centralblatt f. Baktcriologie, Bd. XXXI., Orig., 1902. 



