booster shot


Definition of booster shot

: a supplementary dose of an immunizing agent administered as an injection

called also booster, booster dose

Examples of booster shot in a Sentence

He had to get two booster shots at his latest checkup.
Recent Examples on the Web Health officials can then determine whether someone who previously fought off the virus needs a vaccine, once shots are available -- or whether someone who’s already been inoculated needs a booster shot. Tim Loh,, "Siemens Healthineers, CDC to Develop Covid Antibody Standard," 15 Sep. 2020 Adding to India’s economic woes, the government has little fiscal space to provide a booster shot to the economy. Prathamesh Mulye, Quartz India, "Unless the government acts fast, India faces deep, structural economic problems," 15 Sep. 2020 The effect is similar to a booster shot after a vaccine, to make sure an immune response really sticks. Megan Molteni, Wired, "The First Repeat Covid-19 Infection Case Isn't All Bad News," 25 Aug. 2020 All of the vaccine candidates but one are either requiring or investigating the effectiveness of a booster shot, usually four weeks after the initial shot. Andy Larsen, The Salt Lake Tribune, "A realistic guess at a coronavirus vaccine timeline — and how to know if the process gets politicized," 10 Sep. 2020 That’s all part of the natural course of building immunity over time, akin to receiving a booster shot after a vaccination. Megan Molteni, Wired, "The First Repeat Covid-19 Infection Case Isn't All Bad News," 25 Aug. 2020 The participants will get a booster shot about a month later. Scientific American, "Thousands Volunteer for COVID-19 Vaccine Study," 13 July 2020 The second dose, a booster shot, was required for immunity. Matthew Herper, STAT, "Covid-19 vaccine from Pfizer and BioNTech shows positive results," 1 July 2020 It was meant to be a financial booster shot, a way to help hospitals and health care systems survive the economic onslaught that COVID-19 brought. Detroit Free Press, "Report: Michigan hospitals shorted $130K per COVID-19 patient in federal aid," 24 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'booster shot.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of booster shot

1944, in the meaning defined above

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The first known use of booster shot was in 1944

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Last Updated

26 Sep 2020

Cite this Entry

“Booster shot.” Dictionary, Merriam-Webster, Accessed 29 Oct. 2020.

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More Definitions for booster shot

booster shot


English Language Learners Definition of booster shot

chiefly US : an extra amount of a substance (called a vaccine) that is injected with a needle into a person or animal to help protect against a particular disease

booster shot


Medical Definition of booster shot

: a supplementary dose of an immunizing agent administered as an injection … the state is requiring older children to have additional booster shots for measles, mumps and rubella.— Ann Schrader, The Denver Post, 22 July 1997 — see booster, booster dose

More from Merriam-Webster on booster shot

Nglish: Translation of booster shot for Spanish Speakers

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