The correct option is C It is not a contagious disease
Bird flu is a highly pathogenic disease in poultry. It is caused by the H5N1 virus, which is a type of influenza virus and hence bird flu is also called avian influenza.
It is a highly infectious, severe respiratory disease in birds. Infected birds suffer from heads that continue to swell, a blue colouration of the comb and wattles, dullness, lack of appetite, respiratory distress, diarrhoea and significant drop in egg production.
Avian influenza is contagious and can spread from the infected bird to healthy birds.
It can be transmitted to humans from birds, though it is rare.