what do mean by vaceine? give one example
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A vaccine is an inactivated form of bacteria or virus that is injected into the body to simulate an actual infection. Because the injected microorganisms are 'dead,' they don't cause a person to become sick. Instead, vaccines stimulate an immune response by the body that will fight off that type of illness.
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Vaccine is a preparation of weakened infectious agent or their products that can be injected or given orally to prevent specific diseases.
Example- Smallpox Vaccine.
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