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

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

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  • The biochemical differentiation between Salmonella and Citrobacter 
    Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)
    A number of bacterial isolates which could not be identified as either Salmonella or Citrobacter by conventional biochemical tests and could not be typed as Salmonella with available antisera, were further examined ...
  • A comparative study of the growth of Campylobacter fetus strains in liquid media 
    Van der Walt, Martha L.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The growth of C. fetus fetus, C. fetus venerealis and C. fetus venerealis biotype intermedius was examined in 10 liquid media. From the data obtained, a 10% inoculum size and an oxygen level of 6% seemed imperative for ...
  • The demonstration of the K-antigen of Campylobacter fetus venerealis using a microtitre agglutination test 
    Van der Walt, Martha L.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Using specific antisera prepared against heat-treated and untreated cells in a microtitre system, 7 strains of Campylobacter fetus venerealis were examined for the presence of K-antigen. The technique was effective ...
  • First isolation of Campylobacter jejuni from the vaginal discharge of three bitches after abortion in South Africa 
    Odendaal, M.W.; De Cramer, Kurt Guido Mireille; Van der Walt, Martha L.; Botha, A.D.; Pieterson, P.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Campylobacter jejuni was isolated in pure culture from the vaginal discharge from three German Shepherd bitches after late-pregnancy abortions. The main clinical sign occurring in the bitches was a profuse and odourless ...
  • The flrst isolations of Campylobacter mucosalis from pigs in South Africa 
    Spencer, B.T. (Brian Tom); Loveday, R.K.; Van der Walt, Martha L.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1988)
    The first isolations of Campylobacter mucosalis in South Africa are described. Isolations were made from a 6-week-old weaner pig with necrotic enteritis and from 2 gingival swabs of suckling piglets from herds with histories ...
  • The isolation of Campylobacter hyointestinalis from a pig in South Africa 
    Van der Walt, Martha L.; Van der Lugt, Jaco J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1988)
    The isolation of a strain of Campylobacter hyointestinalis from a piglet is described. The animal originated from a farm where another animal showed signs of intestinal adenomatosis. The animal from which the Isolation was ...
  • Salmonella isolated from crocodiles and other reptiles during the period 1985-1994 in South Africa 
    Huchzermeyer, Fritz W.; Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)
    Over a 10-year period, 173 isolates of Salmonella were obtained during routine isolation from reptiles. Of the 173 isolates, 92 different Salmonella serovars were identified. Of them, 61 (66%) belonged to subspecies I, ...
  • Salmonella isolated from feeds and feed ingredients during the period 1982-1988 : animal and public health implications 
    Durand, Anette M.; Giesecke, W.H.; Barnard, Marie-Luise; Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)
    The prevalence of Salmonella in southern Africa in farm feeds and by-products of animal origin during 1982-1988 was determined. Salmonella occurred in 5,18% of the farm feed samples and in 9,54% of the by-product samples. ...