A vaccine is a preparation that contains _____ .

weakened disease-causing germ

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killed disease-causing germ

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fully active disease-causing germ

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None of these

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Solution

The correct options are
A
weakened disease-causing germ

B
killed disease-causing germ

A vaccine is a preparation that contains weakened or killed pathogens. It cannot cause a full-fledged infection but it can activate the immune system. The immune system prepares weapons against this pathogen and keeps them handy if at all the same pathogen attacks the body again. This is the basis of immunisation.

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