Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Author "Du Plessis, J.L."

Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Author "Du Plessis, J.L."

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  • The application of the indirect fluorescent antibody test in research on heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Du Plessis, J.L.; Malan, Letitia; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The preparation of the antigen, details of the reagents, the titration of the antispecies conjugates and the execution of the indirect fluorescent antibody test are described. The sensitivity and specificity of the test ...
  • The block method of vaccination against heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Du Plessis, J.L.; Malan, Letitia; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    A critical evaluation is made of reports in the literature on the block method of vaccination and the relevant factors that play a role in the immunization against heartwater are also discussed. The most important of these ...
  • The construction of genomic libraries of Cowdria ruminantium in an expression vector, lambda gt11 
    Ambrosio, R.E.; Du Plessis, J.L.; Bezuidenhout, J.D.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Genomic libraries of the Welgevonden and Kwanyanga isolates of Cowdria ruminantium have been constructed in an expression vector. These libraries contain approximately 4 x 10⁵ and 3 x 10⁵ recombinants respectively.
  • Heartwater serology : some problems with the interpretation of results 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Du Plessis, J.L.; Camus, E.; Oberem, P.T.; Malan, Letitia; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Antibodies in the sera of domestic ruminants that have been infected with Ehrlichia bovis and other ehrlichial agents cross-react with the Kümm strain of Cowdria ruminantium used in the indirect fluorescent antibody test ...
  • Heartwater: the development and life cycle of Cowdria ruminantium in the vertebrate host, ticks and cultured endothelial cells 
    Prozesky, L.; Du Plessis, J.L.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Various aspects of the development and life cycle of Cowdria ruminantium are discussed. C. ruminantium is transmitted transstadially by certain Amblyomma species. Apparently organisms initially develop in the gut epithelial ...
  • The non-specific resistance of cattle to heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Du Plessis, J.L.; Malan, Letitia; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    A distinction is drawn between the non-specific resistance to heartwater of very young calves and that of cattle older than a year. The suckling-calf resistance is at its greatest during the first few weeks after birth and ...
  • The pathogenesis of heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Du Plessis, J.L.; Malan, Letitia; Kowalski, Z.E.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Hypotheses on the pathogenesis of heartwater, which have been published so far, are briefly reviewed. Attempts were made at counteracting the effects of vaso-active substances released by mast cells by treating mice infected ...
  • Problems with the interpretation of epidemiological data in heartwater : a study on 23 farms 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Malan, Letitia; Du Plessis, J.L.; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    In an epidemiological study undertaken on 23 farms where heartwater occurs endemically, it was found that on an overall average, antibodies to Cowdria ruminantium were detected in 64,3 % of the cattle, 6 adult Amblyomma ...