Effects of Reticuloendotheliosis Virus and Marek's Disease Virus Infection and Co-infection on IFN-Gamma Production in SPF Chickens

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  • ZHENG Yu-shu
    College of Veterinary Medicine, Shangdong Agricultural University
  • CUI Zhi-zhong
    College of Veterinary Medicine, Shangdong Agricultural University
  • ZHAO Pu
    Department of Animal Science, Henan Institute of Science and Technology
  • LI Hong-mei
    College of Veterinary Medicine, Shangdong Agricultural University
  • LIU Cui-yan
    College of Veterinary Medicine, Shangdong Agricultural University
  • TIAN Zhao-ju
    College of Veterinary Medicine, Shangdong Agricultural University
  • ZHAO Hong-kun
    College of Veterinary Medicine, Shangdong Agricultural University

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Two experiments were used to examine the potential role of IFN-γ in chickens infected with reticuloendotheliosis virus (REV) and Marek's disease virus (MDV). First, chickens were infected with REV and/or MDV at 5 days of age and examined from 3 to 50 days post-infection (dpi). In REV+MDV co-infection chickens, IFN-γ ELISA demonstrated a 3-fold increase at 7 dpi compared to the controls, while REV alone caused a 5-fold increase, the IFN-γ levels peaked, and then gradually decreased. IFN-γ levels significantly decreased in MDV infection at 3 dpi and 15 dpi. Second, experiments were designed to determine the effects of different viruses and ConA on IFN-γ production. For REV- or MDV- infected chickens, the IFN-γ levels decreased slightly after adding ConA. This is the first report of IFN-γ production in SPF chickens infected with REV and MDV measured by directly quantitative method.<br>

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