booster shots
Vaccine follow-up doses
Booster shots are additional doses of a vaccine given after the initial series to restore or enhance immunity that has waned over time.
Some vaccines require boosters at regular intervals—tetanus every ten years, for instance—while others respond to emerging variants: Have you gotten your COVID booster yet?
The term extends metaphorically to anything that reinforces or revives: The win was a booster shot for team morale.
- second doseSubsequent administration of medicine
- herd immunityWidespread resistance protecting all
- immunizationProtective medical injection
- inoculationInjection conferring disease resistance
- antibodiesProteins targeting pathogens
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