The ability of a vaccine to stimulate the production of antibodies that are highly specific to a particular virus is one way vaccines protect against infection.5 Researchers measure the level of these neutralizing antibodies in determining whether a vaccine is triggering an adequate level of protection.6 But a good vaccine maximizes its ability to kindle all of our immune system’s machinery, not only stimulating the production of antibodies but also spurring the activity of T cells and B cells that have memory, and are able to churn out new antibodies and other mediators of our immune response
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