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April 21, 2014

Homework Help: ..

Posted by mary on Tuesday, March 12, 2013 at 6:15pm.

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

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