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What is herd immunity?

# At what point is herd immunity to a given disease observed?
A. After 100% of a population has developed a primary immune response
B. After antibiotics have treated all known cases of disease in a population
C. After 100% of a population has developed a secondary immune response
D. Immediately after 100% of a population has been Immunized
E. After enough people in a population have developed a primary immune response so that spread of an infectious agent is curtailed


The correct answer is E. After enough people in a population have developed a primary immune response so that spread of an infectious agent is curtailed. 

Herd immunity does not require that 100%
of a population be immune. Herd immunity
requires that enough people in the population have elicited memory cells.
Should the pathogen enter the population,
the number of people infected will be small
because the immunized population will not
be able to contract or spread the infection
to the non-immunized population. This
keeps the number of pathogens to a
minimum, for the protection of all.


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