226 a tick-resistant condition in cattle. 



Tick Woery. 



In addition to tick fever, ticks may cause tick woriy. 

 The tv/o conditions may occur independently Lut they are 

 generally associated in the tick-fevered districts in this 

 State. As already stated, tick fever may be produced with- 

 out the agency of ticks, e.g., by inoculation of cattle with 

 ox-blood containing the parasite. The other condition 

 is the result of tick infestation apart from the presence 

 of Babesia. 



The names tick poverty and tick anaemia are often 

 applied to it, particularly to the more serious stages. As 

 one would expect, ticks set up a local irritation which may 

 cause marked uneasiness according to the degree and site 

 of the infestation and according to the individual animal 

 affected. The attacked areas may become infected by pus- 

 producing organis?ns and thus tick sores arise. Some- 

 times these latter are extensive and are reported to become 

 sometimes flyblown (Hunt & Collins, 1896, p. 27 ; Stewart,. 

 1906 ; Tidswell, 1898 : Stewart and others, 1917, p. 16). 



Apart from lesions just referred to, there may be tick 

 anaemia or poverty' where the health of the infested animal 

 becomes seriousl}' affected, the vitality being lowered and 

 condition lost, while the anaemia produced may lead to 

 exhaustion and even death. As already mentioned, tick 

 fever is usally co-existent though general!}' in a mild chronic 

 form (the animals being in the so-called "' immune " con- 

 dition), but in the early days of the tick outbreak in Queens- 

 land Dr. Hunt was able to show that ticks in fever-free 

 areas (i.e., in areas where ticks were not pathogenic) caused 

 cattle to lose condition and sometimes die, and that the 

 blood of such animals when inoculated into health}- animals 

 did not cause piroplasmosis, while those which survived 

 the tick poverty were not protected against tick fever. 

 The two complaints are distinct (Hunt, 1898a; 1898, p. 449 ; 

 1898, p. 116-118 ; 1899c, p. 758 ; 1898c ; Gordon, 1899, p. 92; 

 Thompson, 1899, p. 742 : Tidswell, 1899, p. 5 ; 18996, p.. 

 749 ; 1900, p. 112 ; Stewart, 1906, pp. 1155-1157). Pound 

 has drawn attention to the fact that protective inoculation 

 protects cattle against piroplasmosis and not against tick, 

 attacks, immune animals having been known to die o£ 

 tick anaemia follo'wing gross infestation (1899, p. 107). 



