Multiple Choice
Why is there no lifelong vaccine protection against influenza as there is for measles?
A) Influenza vaccines do not generate an immune response.
B) Influenza can escape host immunity by evolving new variants that reinfect hosts.
C) Influenza is too virulent to effectively vaccinate against.
D) The antigenic memory against influenza has a short half-life.
Correct Answer:
Verified
Correct Answer:
Verified
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