booster dose

noun

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

Example Sentences

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

R21/Matrix-M, developed by the Jenner Institute at Oxford University, uses three doses administered four weeks apart and a booster dose given after one year.

From BBC

Eligible groups were offered two main doses as a minimum, plus a booster dose, with additional boosters for more vulnerable groups later on in the pandemic.

From BBC

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

From Los Angeles Times

Similarly, if you qualify but missed an earlier booster dose, you can have another jab this spring to catch up.

From BBC