FRAMBCESIA TROPICA 



21 



This tick is commonly found along the lines of travel, e.g., rest 

 houses, caravanserai, &c. It may be carried long distances in bedding, 

 mats, porters' cloths, &c. 



The natives protect themselves by applving cow dung to the floors 

 and walls of their houses and by smoking the thatch. 



Pyrethrum powder is good when placed between the sheets. A little 

 sprinkled down the backs of porters is a good measure. 



A night light is a protection. 



Argas pcrsicHS. 



This tick is in shape a flattened oval, yellowish green or red in 

 colour, spotted on the back with many white granulations; its legs 

 are a pale yellow, and the whole insect is much smaller than the one 

 described above. 



Mouth-parts of Ixodes. 



Mouih-parts of Rhipicephalits 



It is found in Persia, Syria, Turkestan, Russia, China, Algeria and 

 Cape Colony. 



It attacks poultry and humans. 



Its habits are those of O. moubata. 



In Persia it may so infest villages that the inhabitants may be 

 driven out of it. 



FRAMBCESIA TROPICA (YAWS). 



DEFINITION. 



A tropical, specific, infectious and contagious disease due to the 

 Treponema pertenuis, characterized by a yellow-tipped, granulomatous 

 eruption. 



DISTRIBUTION. 



Originally it was purely an African disease, now it is widely 

 spread. 



