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Level and duration of serum antibodies in cattle infected experimentally and naturally with bovine virus diarrhoea virus
  1. B. Fredriksen, CandMedVet1,
  2. T. Sandvik, DrScient2,
  3. T. Løken, DrMedVet3 and
  4. S. A. Ødegaard, DrMedVet1
  1. 1 Department of Reproduction and Forensic Medicine
  2. 2 Department of Pharmacology, Microbiology and Food Hygiene
  3. 3 Department of Large Animal Clinical Sciences, Norwegian College of Veterinary Medicine, PO Box 8146 Dep, N-0033, Oslo, Norway


Neutralising serum antibodies against bovine virus diarrhoea virus (BVDV) were monitored for three years in 35 cattle that were infected with the virus as calves; 24 of the calves were inoculated intramuscularly or intranasally, and 11 contracted the infection naturally. All the experimentally infected calves seroconverted within 14 to 28 days after inoculation, and all the animals still had high serum levels of antibodies to BvDv three years after infection. Determinations of antibody levels in milk and blood samples excluded the possibility that the calves had been reinfected with BvDv during the study.

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