76 MANUAL OF HUMAN PROTOZOA 



others hold that it may be a more virulent race of T. gam- 

 hiense or transmitted by different species of Glossina. In 

 nature, this trypanosome appears to be transmitted chiefly 

 bv Glossina morsitans. 



i 



.9- 





f J 



Fig. 18. Trypanosoma rhodesiense in a stained blood film of an inoculated 

 rat. X 1150. (original) 



g 



The method of detecting the flagellate is similar to that 

 iven for T. gamhiense. 



3. Trypanosoma cruzi Chagas 1909 



Synonyms: Schizotrypamim cruzi Chagas 1909 

 Trypanosoma escomeli Yorke 1920 



This trypanosome is the cause of Chagas' disease or 

 South American trypanosomiasis which is mainly a chil- 

 dren's disease, and which is widely distributed in Brazil, 

 Argentina, Uruguay, Peru, Venezuela, Colombia, Panama, 

 Salvador, Guatemala, and Mexico. The trypanosomes are 

 found in the blood and the leishmania-forms (p. 78) in 

 various tissue cells. The organism is transmitted by re- 

 duviid bugs, Triatoma megista and T. infestans, etc., in the 

 digestive tract of which it undergoes developmental 

 changes. 



