Infectious Bursal Disease Virus (IBDV) is a virus that primarily affects chickens, causing a disease known as Infectious Bursal Disease (IBD). This virus targets the bursa of Fabricius, an important organ in the immune system of birds, leading to immunosuppression and increased susceptibility to other infections. IBDV is highly contagious and can spread through contaminated feed, water, and equipment. The disease is particularly severe in young chickens, often resulting in high mortality rates. Vaccination is a common preventive measure to protect flocks from this virus and its associated health risks.