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Browsing South African National Veterinary Repository by Author "Gerdes, Gertruida Hermanna"
Now showing items 1-7 of 7
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Venter, Estelle Hildegard; Van der Lugt, Jaco J.; Gerdes, Gertruida Hermanna; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1993)Two radiolabelled complementary DNA (eDNA) probes (1663 bp and 200 bp res pectively) were prepared from the genome segment that encodes the non-structural protein 1 (NS1) of bluetongue virus serotype 4 (BTV4). The probes ...
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Verwoerd, Daniel Wynand; Gerdes, Gertruida Hermanna; Olivier, A.; Williams, R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)A virulent Newcastle disease virus (NDV) isolate from an outbreak in commercial poultry, with virulence indices of MDT = 47-48 h; IVPI = 2,17 and ICPI = 1,8; was used to inoculate 10x vaccinated (standard poultry vaccines) ...
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Paweska, Janusz Tadeusz; Swanepoel, Robert; Williams, R.; Cohen, A.S.; Grobbelaar, Antoinette A.; Croft, J.E.; Gerdes, Gertruida Hermanna; Wright, Isabel M.; Van Dijk, A.A.; Smith, S.J.; Boomker, Jacob Diederik Frederik (Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2003)An indirect enzyme-linked immunosorbent assay (I-ELISA) for the detection of specific IgG immunoglobulins against Rift Valley fever virus (RVFV) was validated in-house. A total of 3055 sera from sheep (n = 1 159), goats ...
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Du Plessis, D.H.; Van Wyngaardt, Wouter; Gerdes, Gertruida Hermanna; Opperman, E.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)Recently a suspected outbreak of African horsesickness in the Western Cape Province resulted in the deaths of four foals and one adult horse. Spleen samples from these animals were subjected to analysis by an enzyme-linked ...
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Braack, L.E.O.; Grobler, D.G.; Raath, J.P.; Keet, D.F.; Gerdes, Gertruida Hermanna; Barnard, B.J.H.; Kriek, N.P.J.; Jardine, J.; Swanepoel, R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1995)A cluster of four deaths in late December 1993, marked the onset of an outbreak of disease of African elephants (Loxodonta africana) in the Kruger National Park (KNP) in South Africa, which has an estimated population ...
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Bremer, C.W.; Gerdes, Gertruida Hermanna; Aitchison, Henry; Louw, I.; Greyling, Roelf Rudolph; Welgemoed, J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute ., 2000)During 1995/1996 parts of South Africa experienced exceptionally high rainfall. Large numbers of Culicoides midges were seen and an outbreak of African horse sickness (AHS) followed. In the Onderstepoort area, ...
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Barnard, B.J.H.; Gerdes, Gertruida Hermanna; Meiswinkel, R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)In December 1995 to March 1996 and the early summer of 1997 South Africa experienced above average rainfall which favoured the occurrence of Culicoides transmitted diseases. During this period several outbreaks of an ...
Now showing items 1-7 of 7