Immunity of tick-exposed seronegative and seropositive small stock challenged with two stocks of Cowdria ruminantium

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Authors

Du Plessis, J.L.
Van Gas, L.

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Published by the Government Printer, Pretoria.

Abstract

Nineteen per cent and 32 % of serologically positive sheep and goats in heartwater endemic areas of the Republic of South Africa were susceptible to challenge with, respectively, the Ball 3 and Welgevonden stocks of Cowdria ruminantium. There was good correlation between the results of the indirect fluorescent antibody test and immunity, since without exception all the seronegative animals reacted when they were challenged. The fact that only 74% of the seropositive sheep and goats were immune to challenge can probably be ascribed to the poor cross-protection between stocks of C. ruminantium and not to false positive serological reactions.

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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.

Keywords

Veterinary medicine

Sustainable Development Goals

Citation

Du Plessis, JL & Van Gas, L 1989, 'Immunity of tick-exposed seronegative and seropositive small stock challenged with two stocks of Cowdria ruminantium', Onderstepoort Journal of Veterinary Research, vol. 56, no. 3, pp. 185-188.