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Similarity of avian paramyxovirus serotype 1 isolates of low virulence for chickens obtained from contaminated poultry vaccines and from poultry flocks
  1. P. H. J0rgensen, DVM, PhD1,
  2. K. Jensen Handberg, MSc, PhD1,
  3. P. Ahrens, MSc2,
  4. R. J. Manvell3,
  5. K. M. Frost, BSc3 and
  6. D. J. Alexander, PhD, DSc3
  1. 1 Danish Veterinary Laboratory, Hang0vej 2, DK-8200 Aarhus N, Denmark
  2. 2 Danish Veterinary Laboratory, Bulowsvej 27, DK-1790 Copenhagen V, Denmark
  3. 3 Veterinary Laboratories Agency, Weybridge, New Haw, Addlestone, Surrey KTI5 3NB

Abstract

At present Denmark has the status of a ‘non-vaccinating’ country for Newcastle disease and its poultry population should therefore be free of antibodies to avian paramyxovirus 1 (APMV-1). Three live avian vaccines against infectious bronchitis, avian encephalomyelitis, and chick anaemia which had been found to be contaminated with APMV-1 viruses of low virulence for chickens were examined. The vaccines were produced by the same company and the affected batches had been used in Denmark in 1996/97.

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