. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. 348 PARASITES OF THE DOMESTIC ANIMALS and here undergoes its complete development. (Ref. Margaropus annul- atus, Life History, p. 148.) For a number of days following her fer- tilization the female tick engorges with the blood of her host and then drops to the ground where a few days later she deposits her eggs and, having completed her cycle, soon dies. The parasites contained in the blood upon which the tick has fe
. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. 348 PARASITES OF THE DOMESTIC ANIMALS and here undergoes its complete development. (Ref. Margaropus annul- atus, Life History, p. 148.) For a number of days following her fer- tilization the female tick engorges with the blood of her host and then drops to the ground where a few days later she deposits her eggs and, having completed her cycle, soon dies. The parasites contained in the blood upon which the tick has fed reach the eggs and are present in the larval ticks when these are hatched. Thus the larvse have the power to infect any susceptible animal to which they attach. In the first stage of development after gaining the circulation the piroplasma is within the red corpuscle as a single body near the corpuscle's margin. Later it Piroplasma,^ "big- ^^'^^^6^ ^^^^ ^^^ bodies which remain slightly connected eminum (after by a Small filament. A single corpuscle may contain as Crawley, from many as four or even six parasites. The doubled bodies 194, "bu. An. Ind! enlarge, assuming a spindle-shaped and later a pear- U. s. Dept. Agr.) shaped appearance. Finally, as a result of this invasion, the corpuscles break down, and the parasites become free bodies in the plasma. That a multiplicative stage occurs within the bovine host is evidenced from the fact that inoculation of sus- ceptible cattle with a small quantity of virulent blood will produce the disease with the development of myriads of the parasites in the blood of the inoculated animals. Occurrence.—Numerous attempts have been made to produce Texas fever in other species of animals by inoculating them with infected blood from cattle. That all of these experiments have proved negative in- dicates that the disease is one purely bovine. All bovine animals that have never been exposed are susceptible, and in all cases natural i
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