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 Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=20418
Last Editorial Review: 5/7/2002
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