what is vaccination? why is it necessary?? why???
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vaccination is to provide immunity against disease.
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The delivery of a vaccine to aid the immune system in developing protection against a disease is known as vaccination. Vaccines comprise a weakened, live, or deceased microbe or virus, as well as proteins or toxins from the organism. They aid in the prevention of infectious illness sickness by increasing the body's adaptive immunity. Herd immunity occurs when a significant enough percentage of a population is vaccinated. Herd immunity safeguards those who are immunocompromised and unable to receive a vaccine since even a weakened form would be harmful to them.
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