Only One Serotype of Mumps Virus Is Known

Only one serotype of mumps virus is known. Why is this important?

A) It has been possible to create an effective vaccine that protects against this virus.
B) When only one serotype of a virus exists, there is a great risk of mutation in that agent.
C) Herd immunity is not possible in a population if there is only one serotype of a virus.
D) It is not possible to create a vaccine for an infectious agent if there is only one serotype of the agent.
E) B cells and cytotoxic T cells are unable to respond to a virus if there is only a single serotype of that virus.

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