m Russia a staphylinid beetle, Juracekia asphaltina . devours 

 Rhipicephalus ticks (?R. sanguineus ) in nesis of ihe groun d squirrel 

 Uiteilus py^aeus (Fleiontova 1535). ^quirrex, 



DISEASE RELATIONS 



Role in Nature 



_ IIAN: R. s. sanguineus, in some areas, is considered to be the 

 principal vector of boutonneuse fever (ticl<_bite fever), Rickettsia 



conorii,^ (see, however, page 687). It is known to transniTt-tH5 



rickettsia causing the closely related "Indian tick typhus". It 

 IS a vector of Rocky Mountain spotted fever (R. rickettsii) in 

 the warmer parts of the AiBericas. It is said~t o be the ve ctor 

 of a virus causing '"Congolese red fever", a syndrome of moot 

 identity and etiology. 



Persons bitten by this tick sometimes complain of pruritus, 

 due possibly to injection of a toxin while feeding. 



A number of the pathogens listed under experimental relations 

 below may be transmitted in nature but the details have not yet 

 been elucidated. ^ 



V,- un'^^^* -• -• sanguineus transmits two diseases to dogs, the 

 highly fatal canine rickettsiosis, caused by Rickett sia canis, 

 andcanine piroplasmosis, or malignant jaundice, caused 'BT^^besia 



canis. In adaition, it is an intermediate host of Hepatozo^I^ 



canis which results in an anemia and infection when doc^s swallow 

 ticks. Tick typhus or boutonneuse fever, Ricket tsia conorii, is 

 apparently transmitted among dogs and fro m dogs to man by th e 

 kennel tick. It seems likely that this arthropod transmits 

 Salmonella enteritidis . which causes a paratyphoid disease in 

 dogs and m laboratory animals. When dogs are heavily infested, 

 loss of blood and nervous energy from irritation may be severe. 

 See also experimental relations below. 



Other domestic animals: Spirochetosis of sheep, goats, 

 horses, and cattle, caused by Borrelia theileri, is transmitted 

 by the orown dog tick in some areas. 



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