Which one of the following is a viral disease of poultry?

Explanation

New castle disease is a highly contagious zoonoic bird disease affecting many domestic and wild avian species.The causal agent, New castle disease virus (NDV), is a negative­sense single­ stranded RNA virus. Transmission occurs by exposure to faecal and other excretions from infected birds, and through contact with contaminated feed, water, equipment and clothing. Signs of infection with NDV vary greatly depending on factors such as the strain of virus and the health, age and species of the host. They can include respiratory signs (gasping, coughing), nervous signs (depression, inappetence, drooping wings, paralysis), swelling of the eyes and neck, diarrhoea, rough or thin­shelled aggs and reduced egg production.