Alexander, R.A.; Mason, J.H.; Neitz, W.O.; Du Toit, P.J.
(The Government Printer, Pretoria, 1939)
Research work into heartwater, a disease of sheep, goats and cattle caused by Rickettsia ruminantium (Cowdry 1926) has been hampered to a very great extent by the lack of a susceptible small laboratory animal. Up to the ...