STUDIES ON THEILERIIDAE (SPOROZOA) IN TANZANIA .4. FIELD TRIAL ON IMMUNIZATION AGAINST EAST COAST FEVER (THEILERIA PARVA INFECTION OF CATTLE)

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  • 1 January 1976
    • journal article
    • research article
    • Vol. 27  (3) , 329-336
Abstract
Cattle (7), immunized by an infection and treatment method with 3 strains of T. parva (Muguga, Kiambu 5 nd Serengeti transformed), and 5 controls were exposed to natural tick infestation in Tanzania, at a site where 2 precontrols previously contracted fatal East Coast fever [ECF] within 3 wk. All controls became infected with fatal ECF within 1 mo. of exposure. One immunized animal survived, 2 died from a Theileria mutans infection and 1 from a Babesia bigemina infection. The cause of death of the other 3 animals could not be ascertained, but East Coast fever could not be incriminated. Immunized cattle took longer to succumb than the controls, and serological results showed that all immunized animals became infected with T. parva during exposure, without showing symptoms of ECF.