276 PROTOZOOLOGY 



trypanosome as a virulent race of T. gambiense or one transmitted 

 by a different vector, others consider it a human strain of T. hriocei. 

 The disease caused by this trypanosome appears to be more 

 virulent and runs a course of only a few months. It is known as 

 Rhodesian or East African sleeping sickness. The organism is con- 

 fined to south-eastern coastal areas of Africa and transmitted by 

 Glossina morsitans. 



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Fig. 122. Trypanosoma rhodesiense in a stained blood film of an inoculated 

 rat, X1150 (Kudo). 



T. cruzi Chagas (Schizotrypanum cruzi C; T. triatomae Kofoid 

 and McCulloch) (Fig. 123). A small curved (C or U) form about 

 20/i long; nucleus central; blepharoplast conspicuously large, located 

 close to sharply pointed non-flagellate end; multiplication takes 



r 





I 

 Fig. 123. Trypanosoma cruzi, X1150 (Kudo). 1, five trypanosomes in a 

 very thin blood film of an inoculated rat; 2, leishmania forms occurring 

 in the skeletal muscle cell of patient; 3, a flagellating individual seen in a 

 host cell. 



place in the cells of nearly every organ of the host body; upon enter- 

 ing a host cell, the trypanosome loses its flagellum and undulating 

 membrane, and assumes a leishmania form which measures 2 to 5/^ 

 in diameter; this form undergoes repeated binary fission, and a large 

 number of daughter individuals are produced; they develop sooner or 



