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what is the use of vaccination?

Dear Student
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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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Ok..
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Vaccines helps to protect against many diseases that used to much more common.E.g.:Cough , polio etc .
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Dear student, Vaccines help protect against many diseases that used to be much more common. Examples include tetanus, diphtheria, mumps, measles, pertussis (whooping cough), meningitis, and polio. Many of these infections can cause serious or life-threatening illnesses and may lead to life-long health problems. Regards...
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Your first question's answer....just kidding...

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