Abstract
With accruing evidence that the effectiveness of COVID-19 vaccines wanes over time,1–4 and the recent emergence of the omicron (B.1.1.529) variant,5 some countries are rapidly deploying vaccine boosters.6 In the UK, the COVID-19 vaccination campaign launched in December, 2020, and began with prioritised population groups, including people most likely to be at higher risk for severe outcomes or those providing health services or care for these individuals. With emerging evidence from Israel and the UK of vaccine waning, the Joint Committee on Vaccination and Immunisation (JCVI) in September, 2021, recommended boosting individuals in a phased way 6 months after completion of their primary course of COVID-19 immunisation.
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