immune protection. The vaccine has prepared the immune system, but it has not that every viral particle will be stopped at the point of entry.
There is also an important distinction between the body’s early defenses and its broader immune response. Antibodies that can block a virus from entering cells are one component of protection. Other immune cells can help recognize and remove infected cells or coordinate the body’s response. These mechanisms do not all perform the same task, and their effects may become important at different stages of infection.
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