Abstract
The BNT162b2 mRNA vaccine from Pfizer–BioNTech1 and the ChAdOx1 nCoV-19 vaccine from Oxford–AstraZeneca2 were the first two products deployed in the UK's COVID-19 vaccination programme. In accordance with the strategy set by the nation's Joint Committee on Vaccination and Immunisation (JCVI), vaccines were initially prioritised for care home residents and staff, individuals older than 80 years, and front-line health-care and social care workers. In December, 2020, in response to surging transmission of SARS-CoV-2, JCVI advised delaying the second dose of these vaccines to achieve broader population coverage with the first dose.
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