Question

What is the principle behind vaccination? Don't copy from internet... warning...

Answer 1

Explanation:

1). Vaccines contain antigens specific for a particular infection.

2). The antigen after entering human body elicits an immune response against that infection.

3). The memory cells retain the memory and protect the individual against future Infections of that disease causing agent.

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Answer 2

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Infectious agents such as microorganism alive, killed or weakened are injected in very small amount to stimulate the immune system to develop immunity against that particular agents by producing antibodies. These antibodies make the body capable to fight with the diseases caused by microorganisms or infectious agents etc and prevent the development of the disease on subsequent exposure with those disease causing agents.

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