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Sandra Adele (cohort 2019-2020) co-authored this paper assessing the benefits of interval extension between BNT162b2 mRNA vaccine doses.

Extension of the interval between vaccine doses for the BNT162b2 mRNA vaccine was introduced in the UK to accelerate population coverage with a single dose. At this time, trial data was lacking, and we addressed this in a study of UK healthcare workers. The first vaccine dose induced protection from infection from the circulating alpha (B.1.1.7) variant over several weeks. In a sub-study of 589 individuals, we show that this single dose induces SARS-CoV-2 neutralizing antibody (NAb) responses and a sustained B and T cell response to spike protein. NAb levels were higher after the extended dosing interval (6-14 weeks) compared to the conventional 3-4 week regimen, accompanied by enrichment of CD4+ T cells expressing IL2. Prior SARS-CoV-2 infection amplified and accelerated the response. These data on dynamic cellular and humoral responses indicate that extension of the  dosing interval is an effective, immunogenic protocol.

Read the full study on Cell.com.

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