Studies into immunisation of cattle against interdigital necrobacillosis |
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Authors: | B L CLARK D L EMERY D J STEWART J H DUFTY D A ANDERSON |
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Institution: | CSIRO Division of Animal Health, Animal Health Research Laboratory, Private Bag No. 1, Parkville, Victoria 3052 |
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Abstract: | Calves were immunised with fractions of Fusobacterium necrophorum incorporated in mineral oil adjuvant and then each foot was experimentally exposed to interdigital necrobacillosis (foot abscess) by subcutaneous injection of homologous organisms through the interdigital skin. The number of cells from an 18 h liquid culture that might be expected to cause 50% of the feet of control calves to develop marked swellings following subcutaneous injection was shown to be approximately 2.2 X 10(8) cells. Immunity was shown to be associated with antigens that were located in the supernatant of the culture, and which may be identical with or closely associated with the exotoxins. |
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