at preventing infection as time passes.
Antibody levels can decline, and the amount of protection a person has against a new exposure can change. This does not mean that every part of immune memory disappears at the same rate. Some immune functions may persist even as protection against infection becomes weaker.
The practical implication is that a person who was vaccinated some time ago may not have the same level of protection against infection that they had shortly after vaccination.
The effect of time also depends on the outcome being
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