What is an mRNA booster dose?
Quick Answer
An mRNA booster is a later vaccine dose given to renew or strengthen immunity after the initial series. It helps raise antibody levels again.
The Full Story
After vaccination, immune protection can decline over time, especially against viruses that mutate or are especially good at avoiding immunity. A booster dose repeats the immune training so the body produces more antibodies and memory cells. In mRNA vaccination, boosters have been used to restore protection against symptomatic COVID-19 and to improve protection against newer variants. Booster timing depends on the disease, age, and immune status of the person. Boosters are a common part of many immunization programs, not just mRNA vaccines.
Key Facts
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