Newcastle disease is a highly contagious viral infection of poultry caused by Avian orthoavulavirus 1. It aects
the respiratory, nervous, and digestive systems, with symptoms ranging from mild respiratory signs to severe
neurological disorders and high mortality. Transmission occurs through direct contact or contaminated
materials. Vaccination and strict biosecurity are essential for control.
Infectious bronchitis (IB) is a highly contagious viral disease of chickens caused by Avian infectious bronchitis
virus (IBV), a coronavirus. It primarily aects the respiratory tract but can also impact the kidneys and
reproductive system, leading to respiratory signs, decreased egg production, and poor egg quality. Control
relies on vaccination and strict biosecurity.