Abstract
Two African buffalo (Syncerus caffer), an eland (Taurotragus oryx) and a waterbuck (Kobus defassa) were intravenously inoculated with Cowdria ruminantium (Kiswani). Amblyomma gemma nymphs were fed on the animals at 3 weekly intervals. Jugular blood was also collected at 3 weekly intervals and inoculated into sheep. Nymphal ticks that fed on one buffalo on days 16 and 37 and on the other buffalo on day 58 after infection transmitted the disease as adults to sheep. Nymphs that were applied to the eland 16 days after infection also transmitted the disease to sheep. No nymphs that had fed on the waterbuck transmitted the disease. This is the first report of transmission of heartwater by Amblyomma gemma from infected wild ruminant species to a susceptible domestic ruminant species.
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