• A nucleotide-specific polymerase chain reaction assay to differentiate rabies virus biotypes in South Africa 

  Nel, Louis Hendrik; Bingham, J.; Jacobs, Jeanette Antonio; Jaftha, Julian Bernard; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Antigenic and nucleotide sequence analyses have shown that two distinct biotypes of rabies virus are circulating in South Africa. One of these typically infects members of the family Canidae, while the other comprises a ...
• Models for heartwater epidemiology: practical implications and suggestions for future research 

  Yonow, T.; Brewster, C.C.; Allen, J.C.; Meltzer, M.I.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  We present a simple model of the dynamics of heartwater that we use to explore and better understand various aspects of this disease. We adapted the Ross-Macdonald model for malaria epidemiology so that we could consider ...
• The production of an auxotrophic marked, plasmid-cured Salmonella ser. Typhimurium as a live attenuated vaccine 

  Van der Walt, M.L.; Greeff, A.S.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  A number of amino acid requiring auxotrophic strains of SalmonellaTyphimurium were produced by chemical mutagenesis. One of them, strain 81, was cured of the virulence plasmid and attenuated for mice. This strain had an ...
• Individual host variations in tick infestations of cattle in a resource-poor community 

  Dreyer, K.; Fourie, L.J.; Kok, D.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Relative resistance levels of cattle against tick infestations in the communal grazing area of Botshabelo in the south-eastern Free State were determined. The objective was to establish whether differences in resistance ...
• Coccidia oocysts in the faeces of farmed ostrich (Struthio camelus) chicks in Botswana 

  Mushi, E.Z.; Isa, J.F.W.; Chabo, R.G.; Binta, M.G.; Kapaata, R.W.; Ndebele, R.T.; Chakalisa, K.C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Coccidia oocysts were demonstrated in the faeces of 53 (about 34 %) of 156 apparently healthy ostrich chicks. Young chicks had the highest proportion of infestation while those more than 9 weeks old had no oocysts at all ...
• The efficacy of used engine oil against ticks on cattle 

  Dreyer, K.; Fourie, L.J.; Kok, D.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  The study was conducted in a peri-urban agricultural system at Botshabelo, a city in the south-eastern Free State. A questionnaire survey revealed that 88,5% of cattle farmers in the area experienced problems related to ...
• Tick diversity, abundance and seasonal dynamics in a resource-poor urban environment in the Free State Province 

  Dreyer, K.; Fourie, L.J.; Kok, D.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  The objectives of this study were to determine the diversity, seasonal dynamics and abundance of ticks infesting cattle in urban, small-scale farming communities in and around Botshabelo and Thaba Nchu in the eastern Free ...
• Epidemiology of tick-borne diseases of cattle in Botshabelo and Thaba Nchu in the Free State Province 

  Dreyer, K.; Fourie, L.J.; Kok, D.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  A seroepidemiological study was conducted on 151 cattle from the Botshabelo and Thaba Nchu areas in the central Free State Province of South Africa, two areas where small scale, peri-urban cattle farming is practised. An ...
• Subject index 

  Anonymous; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)
• Author index 

  Anonymous; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)
• Protein aggregation complicates the development of baculovirus-expressed African horsesickness virus serotype 5 VP2 subunit vaccines 

  Du Plessis, M.; Cloete, M.; Aitchison, Henry; Van Dijk, A.A.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  This paper describes the expression of a cloned African horsesickness virus (AHSV) serotype 5 VP2- gene by a baculovirus recombinant that was generated by the BAC-TO-BAC™ system. Immunization of horses with crude cell ...
• The clinical efficacy of enrofloxacin in the treatment of experimental bovine pneumonic pasteurellosis 

  Thompson, P.N. (Peter N.); Van Amstel, S.R.; Henton, Marijke M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  The clinical efficacy of enrofloxacin was tested in calves with experimentally induced pneumonic pasteurellosis. A strain of Pasteurella haemolytica, biotype A, serotype 1 (P haemolytica A 1), which had been isolated ...
• Correlation between ability of Ornithobacterium rhinotracheale to agglutinate red blood cells and susceptibility to fosfomycin 

  Fitzgerald, S.L.; Greyling, J.M.; Bragg, R.R. (Robert Richard); Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Twenty five freeze-dried isolates of Ornithobacterium rhinotracheale were used for the determination of minimum inhibitory concentrations (MIC) against the antibiotic fosfomycin (Fosbac, produced by Bedson SA, consisting ...
• Light and electron microscopical observations on the terminal airways and alveoli of the lung of the SA (Cape) fur seal Arctocephalus pusillus 

  Wessels, J.C.; Chase, C.C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  During activities of the Sea Fisheries Research Institute at Kleinzee, lung samples from six South African fur seals were collected. The terminal airways showed pseudostratified ciliated columnar epithelium with numerous ...
• A study on bluetongue virus infection in Saudi Arabia using sentinel ruminants 

  Abu Elzein, E.M.E.; Aitchison, Henry; Al-Afaleq, A.I.; Al-Bashir, A.M.; Ibrahim, A.O.; Housawi, F.M.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Four sentinel herds comprising cattle, sheep and goats were established at various localities in Saudi Arabia. Maternal bluetongue antibodies were detected in all four sentinel herds but disappeared in 4- 6 months, ...
• Review of tsetse flies and trypanosomosis in South Africa 

  Kappmeier, Karin; Nevill, E.M.; Bagnall, R.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  The history of tsetse flies and nagana (trypanosomosis) in South Africa, and especially in Zululand, is reviewed. Four valid tsetse fly species have been recorded from South Africa. Glossina morsitans morsitans disappeared ...
• Serum biochemical values of farmed ostrich (Struthio camelus) in Botswana 

  Mushi, E.Z.; Binta, M.G.; Chabo, R.G.; Isa, J.F.W.; Modisa, Lorna A..; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Reference biochemical values for serum analytes of 126 clinically normal farmed ostriches on one farm in Botswana were established. These included sodium, potassium, chloride, total protein, albumin, urea, creatinine, ...
• Antigenic and genetic analysis of canine parvoviruses in southern Africa 

  Van Vuuren, Moritz; Venter, Estelle Hildegard; Steinel, A.; Parrish, C.R.; Truyen, U.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Canine parvovirus (CPV) is a significant pathogen of domestic and free-ranging carnivores all over the world . It suddenly appeared at the end of the 1970s and most likely emerged as a variant of the well known feline ...
• The distribution of heartwater in the highveld of Zimbabwe, 1980-1997 

  Peter, T.F.; Perry, B.D. (Brian D.), 1946-; O'Callaghan, C.J.; Medley, G.F.; Shumba, W.; Madzima, W.; Burridge, M.J.; Mahan, S.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  Heartwater, the tick-borne disease caused by the rickettsia Cowdria ruminantium has historically been confined to the southern and western lowvelds of Zimbabwe. Since 1986, however, cases of heartwater have been diagnosed ...
• The absence of clinical disease in cattle in communal grazing areas where farmers are changing from an intensive dipping programme to one of endemic stability to tick-borne diseases 

  Tice, G.A.; Bryson, N.R.; Stewart, C.G.; Du Plessis, B.; De Waal, D.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1998)

  A two-year field study was conducted in four communal grazing areas in South Africa. Sera were collected from young cattle (6-18 months old) in these areas during the winters of 1991 to 1993. The sera were tested for ...

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