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4. Public Health England. Unpublished analysis. 2021. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/955239/NERVTAG_paper_on_variant_of_concern__VOC__B.1.1.7.pdf.
5. Docherty A, Harrison E, Semple C. 2021. Hospital case fatality and emergence of variant of concern B.1.1.7, rapid CO-CIN report to NERVTAG and SAGE: unpublished analysis. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/955239/NERVTAG_paper_on_variant_of_concern__VOC__B.1.1.7.pdf.