what are vaccines?How are they useful to us?
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Vaccination protects children from serious illness and complications of vaccine-preventable diseases which can include amputation of an arm or leg, paralysis of limbs, hearing loss, convulsions, brain damage, and death. Vaccine-preventable diseases, such as measles, mumps, and whooping cough, are still a threat.
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Explanation:
a mild form of a disease that is put into a person or a animals blood using injection.
they protect person from infection.
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