booster dose

British

noun

a supplementary injection of a vaccine given to maintain the immunization provided by an earlier dose

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

This was six months after participants received the third yearly booster dose of the vaccine candidate under development, called VLA15.

From The Wall Street Journal • Nov. 26, 2025

Early reports flagged a type of heart swelling called myocarditis as a rare side effect of the mRNA vaccine, particularly for young men ages 18 to 25 after a booster dose.

From Salon • Sep. 5, 2025

And California officials require a booster dose for students entering seventh grade.

From Los Angeles Times • Jun. 5, 2024

While the FDA did allow seniors and others at high risk to get an extra booster dose last spring, most Americans haven’t had a vaccination in about a year.

From Seattle Times • Sep. 8, 2023

Last autumn frontline health and care workers, adults aged 50 and over and some carers and household contacts were also offered a booster dose.

From BBC • Apr. 1, 2023

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023