Multiple Choice
Why is there no lifelong vaccine protection against flu as there is by a measles vaccine?
A) The variety of flu strains is too great to be captured by a single vaccine.
B) Flu can escape host immunity by evolving new variants that re-infect hosts.
C) The flu is too virulent to effectively vaccinate against.
D) The antigenic memory against flu has a short half-life.
Correct Answer:
Verified
Correct Answer:
Verified
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