whether vaccination reduced the person’s overall risk or protected against a more serious outcome.
Why Some Vaccinated People Become Infected
A healthcare professional can help explain how vaccination, previous infection, age, and individual health affect a person’s protection.
There is no single explanation for every breakthrough infection. Several factors can contribute, and they often overlap.
1. Protection changes with time
Immunity after vaccination is not necessarily constant throughout a person’s life. The immune response develops after a dose, changes over the following weeks and months, and may become less effective
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