Investigations on transstadial transmission of bovine anaplasmosis and benign bovine theileriosis in cattle by two species of Amblyomma (Acarina: Ixodidae) : a thesis /
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| Format: | Thesis Book |
| Language: | English |
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[College Station, Tex.] :
[Texas A&M University],
[1974]
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| Subjects: |
| Abstract: | ABSTRACT: Nymphal stages of both Amlyomma americanum (Linnaeus) and A. cajennense (Fabricius) engorged either on a holstein bull calf chronically infected with Anaplasma marginale (Theiler), or on a holstein bull calf chronically infected with a Theileria organism resembling Theileria mutans (Theiler). After natural detachment and molting, the exposed adult ticks subsequently engorged on non-infected splenectomized holstein bull calves. During the engorgement of the exposed adult ticks and for 75 days after their natural detachment, the splenectomized calves were monitored for the presence of blood parasites using both complementfixation tests and Geimsa-stained thin blood smears. No evidence of infection was observed. After 90 days, the splenectomized calves were challenged to see if they were actulaly susceptible to either of the two blood parasites. Inoculations of blood demonstrating a parasitemia of either A. marginale or the Theileria resembling T. mutans were administered to the splenectomized calves which had been previously exposed to the test group of adult ticks. The splenectomized calves develped evidence of both anaplasmosis and theileriosis, suggesting that they were susceptible to the blood parasites at the time of tick infestation. |
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| Item Description: | Vita. "Major Subject: Entomology". Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of Master of Science August 1974"." |
| Physical Description: | vi, 33 leaves ; 27 cm |
| Bibliography: | Includes bibliographical references. |