Du Plessis, J.L.; Bezuidenhout, J. Durr; Ludemann, C.J.F.; Bigalke, R.D.
(Published by The Government Printer, Pretoria, 1984)
Cattle, vaccinated as calves with Cowdria ruminantium-infected tick stabilate, were challenged 6, 12 and 24 months later. In the absence of tick challenge, vaccination of calves induced a partial immunity against subsequent ...