what are vaccines?Why vaccines are administered?
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Answer:
Why vaccines are safe All vaccines are thoroughly tested
Explanation:
A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. 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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Vaccines contain dead or weakened microbes.
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