Chicken anemia virus mutants and vaccines and uses based on the

Details Chicken anemia virus mutants and vaccines and uses based on the Chicken anemia virus mutants and vaccines and uses based on the

1995-06-07

2000-12-19

Mosher, Mary E.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Liposomes

4241781, 424 932, 514 2, 514 44, 4352351, 435455, 435456, 435459, 435 691, 530350, A61K 3816, A61K 9127, C12N 1587, C07K 1401

Patent

active

061624616

ABSTRACT:
The coding information for three putative chicken anemia virus proteins (VP1, VP2, VP3) was inserted into a baculovirus vector and expressed in insect cells. The immunogenic properties of the chicken anemia virus (CAV) proteins produced separately or together in insect-cell cultures were analyzed by inoculating them into chickens. Only lysates of insect cells which have synthesized equivalent amounts of all three recombinant CAV proteins or cells which synthesized mainly VP1 plus VP2 induced neutralizing antibodies directed against CAV in inoculated chickens. Progeny of those chickens were protected against clinical disease after CAV challenge. Inoculation of a mixture of lysates of cells that were separately infected with VP1-, VP2- and VP3-recombinant baculovirus did not induce significant levels of neutralizing antibody directed against CAV and their progeny were not protected against CAV challenge. Our results indicate that expression in the same cell of at least two CAV proteins, VP1 plus VP2, is required to obtain sufficient protection in chickens. Therefore, recombinant CAV proteins produced by baculovirus vectors can be used as a sub-unit vaccine against CAV infections.

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