46 



How is Leishmania donovani transmitted to Man ? 



Probably by the bed-bug, Cimex rotundatus, in which 

 the flagellate stages of this parasite have been found. 



What are Spirochcetes ? 



Active minute filamentous organisms with pliant flexuous 

 bodies. The nuclear substance is diffuse, in the form of 

 chromidia rodlets. Some forms have a membrane called 

 the crista which is not, however, an undulating membrane. 

 Certain species are important blood parasites. 



FIG. 8. Organisms of African Relapsing Fever (Spirochata duttoni), 

 and red blood corpuscles. (Highly magnified.) 



Withjpermission, from "British Museum (Natural History) Special 

 Guide No. 7." 



What Disease is caused by (a) Treponema pallidum, (b) 

 Treponema pertenue, (c) Spirochceta recurrentis, 

 (d) Spirochceta duttoni ? 



Treponema pallidum is the spirochsete of syphilis. 



