Low enhancement serotype 2 vaccine for marek's disease

Drug – bio-affecting and body treating compositions – Antigen – epitope – or other immunospecific immunoeffector – Combination of antigens from multiple viral species

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424 936, 4242291, 424816, 4352351, 435237, 435239, A61K 39255, A61K 3912

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active

055652026

ABSTRACT:
A vaccine for Marek's disease using mutant strains of a serotype 2 field isolate, designated 471B/1, is disclosed. The mutant viruses, which are produced by serial passage of 471B/1 in cell culture, not only retain effective immunizing ability against Marek's disease virus, but which also exhibit reduced enhancement of lymphoid leukosis in comparison to non-passaged 471B/1 and conventional serotype 2 vaccines. These viruses or immunogenic components thereof can be formulated into monovalent and polyvalent vaccines.

REFERENCES:
patent: 4895717 (1990-01-01), Witter
patent: 4895718 (1990-01-01), Witter
patent: 5378467 (1995-01-01), Bexendale
Witter, et al. "Biological Diversity Among Serotype 2 Marek's disease Viruses", Avian Diseases 34:944-957 1990.
Witter, R. L. "Association in broiler chickens between Natural serotype 2 Marek's disease virus infection and leukosis condemnations". In:Proc. International Symposium or Marek's Disease-B. W. Calnek and J. C. Spencer, ed. American Association of Avian Pathologists, Kennett Square, PA pp. 545-554 1985.
Witter, Richard L., Abstract of oral Presentation, "Serotype 2 Marek's Disease Vaccines With Reduced Ability to Enhance Lymphoid Leukosis", World Veterinary Poultry Association, Australia, 16-19 Aug. 1993.

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