What is a vaccine? Briefly explain how does it provide immunity to certain
diseases?
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A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.
A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response. These molecules are called antigens, and they are present on all viruses and bacteria.
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when a disease carrying microbe enters our body produces ANTIBODIES to fight the invader
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