booster shot

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booster shot

n.
An additional dose of an immunizing agent, such as a vaccine or toxoid, given at a time after the initial dose to sustain the immune response elicited by the previous dose of the same agent. Also called booster dose.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

booster shot

Immunology A 2nd immunization dose, administered after an appropriate time interval, allowing the body to mount an immune response; when a person is exposed–eg, to 'dirty' wounds, or plans potential exposure–eg, travel to regions endemic for certain infectious agents, the BS provides a rapid anamnestic response that outpaces the development of disease–eg, tetanus
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.