Abstract
Blood from 2 buffalo harbouring Theileria organisms was inoculated into a splenectomized Ayrshire calf. The calf developed an infection which extended over a long period. The infection was transmitted to two cattle with Amblyomma gemma by transstadial transmission between the larvae and nymphs. Severe anaemia developed in these cattle and correlated with the parasitaemia. Schizonts morphologically characteristic of T. mutans were detected for short periods in the lymphoid cells of cattle infected by the ticks. The antigens and sera prepared from the cattle reacted with T. mutans sera and antigens in the indirect fluorescent antibody test. After recovery from the primary parasitaemia, the cattle had detectable organisms and antibodies to T. mutans for more than two years.
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