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Studies on vaccination against papillomaviruses: the immunity after infection and vaccination with bovine papillomaviruses of different types
  1. WF Jarrett,
  2. BW O'Neil,
  3. JM Gaukroger,
  4. KT Smith,
  5. HM Laird and
  6. MS Campo
  1. Department of Veterinary Pathology, University of Glasgow Veterinary School, Bearsden.


Calves, free of antibodies to bovine papillomaviruses (BPV), were reared in isolation. One was infected with BPV-2, developed tumours and was resistant to homologous reinfection. Groups of calves were infected with BPV-2, BPV-5 or BPV-6; they all developed and subsequently rejected type-specific tumours. They were then infected with BPV-4; they were not immune and oral papillomas were induced. Groups of animals were vaccinated by intramuscular preparations of purified BPV-4 and BPV-6 and were challenged with homologous virus; all were immune to reinfection. An earlier experiment had shown this to be true for BPV-2. Two calves, immune to BPV-6, were not immune to BPV-1. These experiments, although they do not cover all the possibilities of reciprocal immunisation and challenge, indicate that prophylactic immunity to a range of papillomaviruses is type-specific. This is the first clear demonstration of this phenomenon in the papillomavirus group.

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