Why is a person who has already had chickenpox considered to be "immune" to developing the disease again even if he or she is heavily reexposed to the virus again?
A) On reexposure to the came virus,his or her sensitized B lymphocytes generate large amounts of antichickenpox antibodies.
B) This person's neutrophils and macrophages are able to recognize the virus sooner and make antibodies against it.
C) Once a person has had chickenpox,the virus can never enter his or her body again.
D) He or she has developed naturally acquired passive immunity to the virus.
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