128 DISEASES DUE TO I'KOTOZOA 



U is ihe must widely disl-ribuled pathogenic irypanosome of 

 Central Africa. 



It causes nagana amongst domestic animals. 



In Nyasaland it causes trypanosomiasis in man. 



It is rapidly fatal to man and domestic animals. 



It is carried by the Glossinae morsitans and pallidiijes. 



(2) T. gambiense. 

 Synonym : T. nigeriense. 



It causes trypanosomiasis in man. 



Cattle and antelopes form the reservoir for the virus without causing 

 symptoms in them. 



This trypanosome is less fatal to man than T. rhodesiense. vSome 

 recover. 



It is carried by the G. palpalis. 



(3) T. evansi. 

 Synonym : T. soudanense. 



It causes surra in horses and mules, camels and cattle in India, 

 Philippines, Mauritius, North Africa, &c. 



It is transmitted by the bites of fleas, flies and ( ?) b\- eating infected 

 meat. 



(4) r. equiperdum. 



It causes dourine or mal de coit in horses in Europe, India, Xorth 

 America and North Africa. 



It is spread by coitus. 



It is always fatal from two to eighteen months. 



Group (B): Trypanosoma Pecorum Group. 



General features of all in this group : — 



All are small and monomorphic. 



The cytoplasm is non-granular. 



The kinetonucleus is prominent, sub-terminal, and often seems to 

 project beyond the margin. 



The undulating membrane is fairly well developed. 



Development begins in the intestine, and later passes to the 

 proboscis and salivary duct or hypopharynx, where they complete their 

 development and beco)ue infective. 



(i) T. pecorum. 



Synonyms : T. confusum, T. nanum. 



It causes an important trypanosomiasis in cattle. 



It is carried bv T. morsitans, in which its development takes place. 



It is also carried mechanically by Tabanidfe (?). 



(2) T. simice. 



Synonym : T. ignotum. 



It rapidly kills domestic pigs. 



