Clarification Of Vasculature-Associated Lymphoid Tissue As A Key Player In Avian Respiratory Immunity.

VALT in chicken lungs provides structural basis for respiratory immunity and vaccine development.

This study characterizes vasculature-associated lymphoid tissue (VALT) in chicken lungs for the first time, establishing its role in avian respiratory immunity. Lung tissue from broiler chickens at 1, 15, and 28 days of age was analyzed using histological and immunofluorescence techniques. VALT develops progressively from scattered immune cells in day-old chicks to a fully organized, structurally distinct tissue by 28 days of age. The mature VALT comprises B cells, T cells, and macrophages, supported by an extensive vascular network including blood vessels, lymphatic vessels, and high endothelial venules. The tissue possesses a well-organized connective tissue framework and contains MHCII-expressing macrophages, indicating antigen presentation capability. These findings provide structural and cellular characterization essential for understanding respiratory immune mechanisms in poultry. The research establishes a foundational basis for future investigations into vaccine development strategies and therapeutic interventions targeting respiratory infections in broiler chickens, addressing a significant production challenge in intensive poultry systems.

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