The events leading to the production of an effective vaccine against heartwater are summarized. The production techniques used at Onderstepoort to produce and control the quality of the infected blood and nymph suspension vaccines, and covering their respective advantages and disadvantages, are compared. The many problems of these vaccines and how they may best be overcome are discussed.
The 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.