Which indicates there is secondary vaccine failure?
A) The failure of a vaccine to stimulate any immune response
B) The waning of immunity following an initial immune response
C) Vaccine failure caused by improper storage or improper administration route
D) State in which those not immune will be safe if a certain proportion of the population has been vaccinated
Ans: B
Secondary vaccine failure is the waning of immunity following an initial immune response. Primary vaccine failure is the failure of a vaccine to stimulate any immune response. It can be caused by improper storage or improper administration route. Herd immunity refers to a state in which those not immune to an infectious agent will be safe if a certain proportion of the population has been vaccinated or is otherwise immune.
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