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October 23, 2014

Homework Help: Science

Posted by George wang on Wednesday, May 2, 2012 at 5:37pm.

A vaccine can protect you against a disease because it

(1)destroys toxic substances from bacteria before they can make you sick\
(2) stimulates your immune system against the pathogens
(3) kills any pathogenic bacteria in your body
(4) changes pathogenic bacteria into harmless bacteria

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