A vaccine is a substance that contains a harmless version of a

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asked Jan 28, 2023 55.7k views

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John Allijn · Answer 1 · 2023-02-01T17:36:57+0000

A vaccine is a substance that contains a harmless version of structures which resembles pathogens themselves and is usually produced from the weakened forms of the pathogen.

A vaccine is a substance that contains a harmless version of a

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