Novel variant bursal disease virus and application thereof in egg yolk antibody

The invention discloses a novel variant bursal disease virus strain, which is characterized in that the preservation number of the novel variant bursal disease virus strain RD230902A is CGMCC (China General Microbiological Culture Collection Center) No. 45886. The invention also provides an inactivated vaccine and an egg yolk antibody prepared from the strain. The egg yolk antibody prepared from the novel variant bursal disease strain RD230902A solves the problem that no antibody/vaccine capable of preventing the novel variant bursal disease exists in the prior art, and the novel variant bursal disease is effectively prevented and controlled. Compared with a serum antibody in the prior art, the preparation method of the egg yolk antibody is simple, blood sampling is not needed, and the egg yolk antibody can be obtained by only collecting and purifying immune hyperimmune egg yolk; the preparation method is simple and convenient, and is suitable for large-scale production, popularization and application. 本发明公开了