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Effective protection by high efficiency bicistronic DNA vaccine against infectious bursal disease virus expressing VP2 protein and chicken IL-2. | LitMetric
Infectious bursal disease (IBD) is an acute and contagious viral infection of young chickens caused by IBD virus (IBDV). IBDV belongs to genus Avibirnavirus of family Birnaviridae. It is a non-enveloped virus with icosahedral symmetry that contains two segments of double-stranded RNA. The virus affects the lymphoid tissues of chickens, mainly the B cells of bursa of Fabricius, leading to severe and prolonged immunosuppression. VP2, a major structural protein of IBDV, contains antigenic epitopes responsible for induction of neutralizing/protective antibody. In the present study, VP2 gene of IBDV was cloned in a bicistronic vector along with chicken interleukin-2 (chiIL-2) as an adjuvant. An in vivo challenge study of bicistronic DNA vaccine expressing IBDV-VP2 and chicken IL-2 showed effective protection against a lethal IBD infection in chickens. In addition, mortality, gross picture of bursa and histopathological findings demonstrated the efficacy of the vaccine in reducing virulence of the disease.
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