ANIMAL PARASITES AND PARASITIC DISEASES 335 



the female ticks, which develop on infected animals, transmit 

 them to their progeny, the little spider-like larvae, which act as 

 the intermediate hosts for the infection. It is through these 

 young ticks that the actual cause of Texas fever is spread from 

 animal to animal. 



The symptoms of the disease begin in seven to ten days and 

 are high fever, constipation followed by diarrhea, dark brown 

 and finally red colored urine, and jaundice. A positive diagnosis 

 is made if the small ticks are found attached to the belly, inside 

 of the thighs, and brisket. Treatment is usually unsatisfactory 

 for no specific medicine is known. Immunity is conferred 

 through an attack of the disease. Prevention must include 

 exclusion and extermination of the ticks. Ticks are easily 

 killed by frost so are not dangerous in the North after the first 

 frost. 



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