Abstract
Theileria taurotragi and Theileria sp. (Idobogo) isolated from Kenyan eland and Tanzanian cattle, respectively, have many characteristics in common. It was found that tick-derived stabilites of Theileria sp. (Idobogo) were infective to eland, although only very mild infections developed. Eland that had recovered from Theileria sp. (Idobogo) infections were susceptible to challenge with T. taurotragi stabilate, and similar infections developed in control eland. Cattle that had recovered from Theileria sp. (Idobogo) infection were immune to challenge with T. taurotragi, in contrast to cattle that had recovered from T. taurotragi, which were susceptible to Theileria sp. (Idobogo) challenge. Using T. taurotragi piroplasm antigen in the indirect fluorescent antibody test, a high degree of cross-reaction was observed between T. taurotragi and Theileria sp. (Idobogo) antisera. It would appear that T. taurotragi and Theileria sp. (Idobogo) represent strains of the same species which are adapted to different hosts.
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