what is vaccination
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Vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened or killed state, or proteins or toxins from the organism. ... When a sufficiently large percentage of a population has been vaccinated, herd immunity results.
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A vaccine is an antigenic substance that develops immunity against a disease which can be delivered through needle injections or by mouth or by aerosol. Vaccination is the injection of a dead or weakened organism that forms immunity against that organism in the body.
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