Some effects of ⁶ºCo irradiation on Cowdria ruminantium in its tick host Amblyomma hebraeum Koch (Acarina: Ixodidae)
Spickett, Arthur M.; Bezuidenhout, J. Dürr; Jacobsz, Catharina J.; Steyn, P.J.J.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B.
An attempt was made to attenuate Cowdria ruminantium by irradiation of the nymphal stage of
its tick host, Amblyomma hebraeum. The irradiated nymphae were homogenized and serial dilutions
of the resultant suspension were injected intravenously into heartwater-susceptible sheep. No attenuation
could be demonstrated but the results indicate that progressively more micro-organisms will be
destroyed the higher the irradiation dosage applied, and that dosages between 20 and 30 kilorad
apparently prove fatal to all the pathogenic organisms.
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.