Answer: the following options are true of the Virus A:
--> b (It caused an epidemic/outbreak)
--> d (It is an emerging virus.)
--> f (It is a zoonotic virus.)
Step-by-step explanation:
Virus is a type of microorganism that contains a genetic material and is surrounded by a protein coat called capsid.
Virus such as virus A from the question is an EMERGING VIRUS because it just newly infected the boy who is it's first host causing a disease that is unknown. An emerging virus has the ability of increasing in incidence which happened with Virus A although is was put under control through public health activities.
Virus A is said to cause an EPIDEMIC because it occured in an unusually high number of individuals in a community at the same time. From the question after the boy fell sick,80% of the members of his village(one particular geographic region) became sick with the disease caused by Virus A.
A large number of infectious diseases that occur in humans also occur in animals. A disease that occurs primarily in animals (example, rats) but is occasionally transmitted to humans, either through direct blood contact, faecal or urine of these infected animals, is called Zoonosis. Therefore Virus A is a zoonotic virus because the boy contracted this virus from rat droppings near his home.