define toxin and vaccine
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About TOXIN :
Toxin is a poisonous substance that is a specific product of the metabolic activities of a living organism and is usually very unstable, notably toxic when introduced into the tissues, and typically capable of inducing antibody formation.
About VACCINE :
Vaccine: A product that stimulates a person's immune system to produce immunity to a specific disease, protecting the person from that disease. Vaccines are usually administered through needle injections, but can also be administered by mouth or sprayed into the nose.
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The toxin invades the bloodstream and is largely responsible for the symptoms of the disease. The protein-based toxin is rendered harmless (toxoid ToxoidInactivated or killed toxin (poison) used in vaccine production.) and used as the antigen in the vaccine to elicit immunity.
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