Q1. Which one of the following is a viral disease in animals?
A Blue tongue disease Correct
B Milk fever
C Anthrax
D Johne's disease
Explanation
Blue tongue disease is a viral disease of ruminant animals, especially sheep, and is caused by the bluetongue virus. It is spread mainly through biting midges. Milk fever is not an infectious viral disease; it is a metabolic disorder linked with low blood calcium after calving. Anthrax is caused by the bacterium Bacillus anthracis. Johne's disease is a chronic bacterial disease caused by Mycobacterium avium subspecies paratuberculosis, so it is also not viral.