Asked by mary

if you already had the chiken pox you can be arournd a person with the disease without no fear of becoming sick. what feature of the immune system explains this?

a. acquired immunity
b. cell- mediated immunity
c. humoral immunity
d. primary immune system
Answered by Ms. Sue
http://www.niaid.nih.gov/topics/immunesystem/Pages/immunity.aspx
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