Question

1. which one of the following is not a condition that must be met before a human influenza pandemic can occur? a a new virus subtype emerges. b the virus causes serious human illness. c the virus must cause serious illness in birds. d the virus must spread easily from person to person.

Explanation:

For a human influenza pandemic to occur, a new virus subtype needs to emerge, it should cause serious human illness, and spread easily from person - to - person. Whether it causes serious illness in birds is not a necessary condition for a human influenza pandemic.

Answer:

C. The virus must cause serious illness in birds