Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa)Stewart, C.G.Bigalke, R.D.2014-11-202014-11-2020141987Stewart, CG 1987, 'Specific immunity in farm animals to heartwater’, Onderstepoort Journal of Veterinary Research, vol. 54, no. 3, pp. 341-342.0330-2465http://hdl.handle.net/2263/42675The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.The duration of immunity to heartwater normally varies from 6 months to 4 years. In Angora goats it may be difficult to produce a specific immune response with vaccination. Humoral immunity does not appear to play a role in the development of immunity. It has been suggested that cellular immunity may play a role, but the actual mechanism involved remains obscure. The specific immune response developing in farm animals following infection with Cowdria ruminantium is reviewed.en©ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaHeartwater -- South AfricaArticle