数字农科院2.0

The Mutated Very Virulent IBDV (mvvIBDV) Suppresses Immune Responses to Avian Influenza and Newcastle Disease Immunization

文献类型： 外文期刊

作者： Hangbo Yu ; Dan Ling ; Ziwen Wu ; Chen He ; Guodong Wang ; Jingli Liu ; Mengmeng Huang ; Yulong Zhang ; Runhang Liu ; Erjing Ke ; Xianyun Liu ; Suyan Wang ; Hongyu Cui ; Yanping Zhang ; Yuntong Chen ; Yongzhen Liu ; Yulu Duan ; Xianying Zeng ; Yulong Gao ; Xiaole Qi

关键词： Atypical IBD;; Mutated very virulent IBDV (mvvIBDV);;A3B3;;Pathogenicity;;Immunosuppression

期刊名称： POULTRY SCIENCE

ISSN： 0032-5791

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Infectious bursal disease (IBD), caused by infectious bursal disease virus (IBDV), is one of the most devastating immunosuppressive diseases in poultry, posing persistent threats to global poutry farming. Over the past three decades, very virulent IBDV (vvIBDV) with high mortality has been an important dominant epidemic strain. To make matters worse, since 2023, outbreaks of atypical IBD attributable to a mutated vvIBDV (mvvIBDV) has been reported across multiple provinces in China. However, the harm of mvvIBDV has not yet been systematically recognized. In this study, an mvvIBDV strain of genotype A3B3, designated IBDV-SD24-1403, was isolated and characterized for the first time. The full-length genome analysis revealed that IBDV-SD24-1403 strain locates on the branch of A3B3 vvIBDV in the evolutionary tree but contains four significant residues substitutions (A222T, G254D, I256L, and D279N) in VP2. Subsequent challenge experiments in specific-pathogen-free (SPF) chickens demonstrated that, unlike vvIBDV, IBDV-SD24-1403 induces an atypical IBD, characterized by non-lethality but severe acute damage to immune tissues including bursa, spleen, and thymus. Furthermore, we provide the first experimental evidence that chickens pre-infected with mvvIBDV exhibited a marked reduction in hemagglutination inhibition (HI) antibody production compared to the non-infected control group immunized by avian influenza (AI) or Newcastle disease (ND) vaccines. This study identified mvvIBDV of A3B3 as an important pathogen of atypical IBD and revealed for the first time the significant roles of mvvIBDV in clinical immune failure in poultry, which is of great significance for the healthy development of the poultry industry.

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