Question

how do vaccines help in preventing diseases

Answer 1

it developed our immune system for a particular disease and when that disease's pathogens come in our body so our immune system give very good response to it

Answer 2

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Vaccines contain dead or weakened microbes . When a vaccine is injected or swallowed, our body produces antibodies In response to the injected antigens . These antibodies remain in the body to fight the antigen and protect the body from any future infections. Therefore, the body becomes immune to the diseases. The administration of vaccines is called vaccination or immunisation .