Plague; R. _s. sanguineus does not appear to play a role in 

 the natural transmission or preservation of Pasteurella pestis, 

 although it is claimed that the subspecies schulzei has been 

 found naturally infected. 



Tularemia ; Bacterium tularense survives from the larval to 

 adult tick and may be transmitted by any stage. 



Toxoplasmosis; Toxoplasma gondii acquired by immature stages 

 feeding on an infected host may be retained during the later devel^ 

 opmental stages of the tick. There is some possibility of trana. 

 o-varial infection but this has not been definitely proven. Results 

 of experiments in these respects by various workers are contra 

 dictory. The probability of natural transmission remains unknown. 



^^s. azar ; Leishmania donovani sxirvives in the kennel tick 

 but can be transmitted only experimentally. 



^^^3s disease ; R. s. sangiiineus may mechanically transmit 

 Trypanosoma cruzi . "* ~ 



Experimental (Animal Diseases and Syndromes ) 

 Tick paralysis ; See above . 

 ToxoplasiTPsis ; See above. 



Guineapig pneumonia ( "pneimopathie du cobaye " ) ; The kennel 

 tick is not a vector of the causative virus of this disease. 



^q^^^s piroplasmoses ; R. s. san,^:uineus is a vector of both 

 Babesia caballi and Nuttallia equi . 



Rodent piroplasmoses ; Circumstantial evidence indicates that 

 this tick may transmit Piroplasma quadri.Teninum of the gondi. 

 This tick transmits a benign x.uitd-lia ivsp.j to jirds, Kerion es 

 tristrami . 



Tropical theileriasis ; It is said that this tick is a vector 

 of Theileria annulata of cattle. 



^^st Coast fever ; R. s. sanguineus does not transmit Theileria 

 parva of cattle. ~ 



- 715 - 



