A vaccine
a. can be harmful because it contains pathogens such as viruses.
b. contains a changed pathogen, so the pathogen is no longer harmful.
c. provokes a response from the viral immune system.
d. all of the above

Question

14-03-2014
Biology

Answered

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A vaccine
a. can be harmful because it contains pathogens such as viruses.
b. contains a changed pathogen, so the pathogen is no longer harmful.
c. provokes a response from the viral immune system.
d. all of the above

Sagot :

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