Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Booster shot
Medically reviewed by Min Clinic Staff | Updated: January 2026
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.