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Definition of Booster shot

Booster shot: An additional dose of a vaccine needed periodically to 'boost' the immune system. For example, a booster shot of the tetanus and diphtheria (Td) vaccine is recommended for adults every 10 years.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=20418
Last Editorial Review: 3/19/2012

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