Studies on Theileriidae (Sporozoa) in Tanzania IX. Unidentified bovine Theileriae.

Two strains of nonpathogenic Theileriae, designated as Theileria sp. (Idobogo) and Theileria sp. (Mwanza), were isolated from cattle in southern and northern Tanzania respectively. They were similar to each other, producing low numbers of T. parva-like macroschizonts and of small piroplasms. Both were readily transmitted by Rhipicephalus appendiculatus. No serological relationship with T. mutans was found, while serum of some of the recovered animals gave fleeting, low titres in the indirect fluorescent antibody test to T. parva schizont antigen. Recovered animals were fully susceptible to T. parva challenge. The possibility that these strains may be similar to Theilleria sp. (Githunguri) of Kenya is suggested.