write a short note on vaccine
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A vaccine is a substance that involves protecting the human body from certain diseases. In the vaccines, a dead or weakened version of a microbe is present. Generally, the vaccine helps the immune system to recognize and destroy the living microbe during a future infection.
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A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.[1] A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.
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