acquired immunity

Science Dictionary
acquired immunity  
Immunity that is not inherited. Acquired immunity can be active or passive. ◇ Active immunity results from the development of antibodies in response to an antigen, as from exposure to an infectious disease or through vaccination. ◇ Passive immunity results from the transmission of antibodies, as from mother to fetus through the placenta or by the injection of antiserum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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