What do vaccines do?

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  1. Dr. Michael Roizen
     
    Dr. Michael Roizen answered:
    Vaccines are a kind of immune-insurance policy. Although the body comes stocked with millions of different antibodies, there is always the chance that the one you need won't be available when you need it.

    Vaccines—typically, weakened strains of viruses or parts of bacteria—cause the body to produce antibodies for that specific infection. So rather than the usual delayed immune response that allows a cold virus to take hold, the antibodies produced by a measles vaccine are ready to knock out that disease before it ever gets started.
    More Related Answers from Dr. Michael Roizen
    Vaccines are a kind of immune-insurance policy. Although the body comes stocked with millions of different antibodies, there is always the chance that the one you need won't be available when you need it. Vaccines—typically, weakened strains... More