Browsing South African National Veterinary Repository by Author "Van der Walt, M.L."

Browsing South African National Veterinary Repository by Author "Van der Walt, M.L."

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  • Phage types of Salmonella enterica serovar Enteritidis isolated in South Africa from 1991-1995 
    Mare, L.; Van der Walt, M.L.; Dicks, L.M.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute ., 2000)
    A total of 615 strains of Salmonella enterica serovar Enteritidis (SE), received from 1991-1995 at the Onderstepoort Veterinary Institute (OVI), were phage typed. Most SE isolates (54,7%) originated from poultry followed ...
  • The prevalence of intestinal Salmonella infection in horses submitted for necropsy 
    Van Rensburg, I.B.J.; Jardine, J.E.; Carstens, J.H.; Van der Walt, M.L.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1995)
    Specimens from the ileum, colon and rectum were aseptically collected from 50 consecutive horse carcases submitted for necropsy to the Department of Pathology, Faculty of Veterinary Science, University of Pretoria. ...
  • 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 ...