Asked by George wang

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

IS THE ANSWER (4)

Answers

Answered by PsyDAG
I don't agree.

http://www.cdc.gov/vaccines/vac-gen/howvpd.htm
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