Gumboro Disease (Infectious Bursal Disease) Pathology
Technical reference on Avian Birnavirus pathogenesis, bursa lesions, and maternal titers.
Scientific Overview
Infectious Bursal Disease (IBD), commonly known as Gumboro, is an acute, highly contagious viral disease of young chickens. Caused by an avian birnavirus, it selectively destroys immunoglobulin-producing B-lymphocytes in the Bursa of Fabricius, leading to acute temporary or permanent immune suppression.
Target Organ and Pathogenesis
IBD primarily targets chicks between 3 and 6 weeks of age, when the Bursa of Fabricius is at its peak physiological size. The virus destroys lymphatic follicles in the bursa, rendering the bird highly vulnerable to secondary bacterial infections like Colibacillosis (E. coli), and causing poor vaccination responses.
Bursal Lesions & Muscle Hemorrhages
Necropsy reveals an enlarged, edematous Bursa of Fabricius covered in gelatinous transudate, which may progress to severe congestion and hemorrhage ('strawberry/black cherry bursa'). Hemorrhages are also prominent in the breast and thigh muscles, and kidneys show severe swelling with urate deposition.
All scientific data, diagnostic criteria, and performance benchmarks presented on this page are derived from published peer-reviewed journals and official veterinary codes:
- Avian Pathology & Diagnostics: World Organisation for Animal Health (WOAH, 2023). Manual of Diagnostic Tests and Vaccines for Terrestrial Animals. Paris, France.
- Poultry Diseases & Histology: Swayne, D.E., et al. (2020). Diseases of Poultry (14th ed.). Wiley-Blackwell / American Association of Avian Pathologists.
- Nutrition & Feed Chemistry: Leeson, S. & Summers, J.D. (2001). Commercial Poultry Nutrition (3rd ed.). University Books, Guelph, Ontario.
- Commercial Breed Standards: Aviagen (2024). Ross 308 & Cobb 500 Broiler Performance Objectives. / Lohmann Breeders (2024). Lohmann Brown Management Guide.