| Autor: |
El-Dabae WH; Microbiology and Immunology Department, Veterinary Research Division, National Research Center, Dokki, Giza, 12622, Egypt., Hussein HA; Virology Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt. husvirol@cu.edu.eg., Rohaim MA; Virology Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt.; Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster, LA1 4YG, UK., El-Safty MM; Central Laboratory for Evaluation of Veterinary Biologics, Abbasia, Cairo, 11381, Egypt., Ata NS; Microbiology and Immunology Department, Veterinary Research Division, National Research Center, Dokki, Giza, 12622, Egypt., Reda IM; Virology Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt. |
| Abstrakt: |
Despite extensive vaccination campaigns, Newcastle disease virus (NDV) remains endemic in many countries worldwide, and factors that contribute to this failure include mismatched vaccines, partial immunization, and poor husbandry practices. In order to overcome the problem of genetic divergence between circulating field strains and vaccine strains, we saponin-adjuvanted an Egyptian field strain and assessed its safety and immunogenicity in chickens. Immunization of chickens with the vaccine followed by challenge with a velogenic reference strain revealed the potential of the saponin-adjuvanted vaccine to induce a strong immune response that resulted in complete protection of chickens. Importantly, in vaccinated chickens, virus shedding was abolished, providing an added advantage over the currently available commercial live-attenuated and inactivated vaccines, which are unable to prevent shedding. A histopathological investigation demonstrated that the vaccinated chickens had less-severe lesions than challenged unvaccinated and mock-vaccinated chickens. We propose using this formulation as an alternative and improved NDV vaccine platform that can be exploited to control disease not only in Egypt but also in other disease-endemic countries. |
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