The vaccines may be
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WHO's 'Vaccine Explained' series features illustrated articles on vaccine development and distribution. Learn more about vaccines from the earliest of research stages to their rollout in countries.
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vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.
Mainly a vaccine typically contain an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe and is injected into a person or an animal’s blood using a needle (an injection) in order to protect the body against that disease.
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