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2. World Health Organization. Coronoavirus disease (COVID-19): Vaccines Q&A. October 28 2020. https://www.who.int/news-room/q-a-detail/coronavirus-disease-(covid-19)-vaccines

3. WHO. Draft landscapre of COVID-19 candidate vaccines. Updated December 29 2929. https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines

4. PHE. Immunisation against infections disease. ‘The Green Book’. Chapter 1: Immunity and how vaccines work. Updated December 16 2020. https://www.gov.uk/government/publications/immunity-and-how-vaccines-work-the-green-book-chapter-1

5. G Zimmer. ‘RNA Replicons - A New Approach for Influenza Virus Immunoprophylaxis’. Viruses 2010, 2(2), 413-434. https://www.mdpi.com/1999-4915/2/2/413

6. N Pardi et al. ‘mRNA vaccines — a new era in vaccinology’. Nature Reviews Drug Discovery. January 12 2018. 17:261–279. https://www.nature.com/articles/nrd.2017.243

7. Centers for Disease Control and Prevention (CDC). Understanding mRNA COVID-19 Vaccines. Update December 18 2020. https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/mrna.html

8. MHRA. Decision. Information for Healthcare Professionals on Pfizer/BioNTech COVID-19 vaccine. Updated December 31 2020. https://www.gov.uk/government/publications/regulatory-approval-of-pfizer-biontech-vaccine-for-covid-19/information-for-healthcare-professionals-on-pfizerbiontech-covid-19-vaccine

9. European Medicines Agency. ‘EMA receives application for conditional marketing authorisation of COVID-19 mRNA vaccine BNT162b2’. December 1 2020. https://www.ema.europa.eu/en/news/ema-receives-application-conditional-marketing-authorisation-covid-19-mrna-vaccine-bnt162b2

10. MHRA. Decision. Information for Healthcare Professionals on COVID-19 Vaccine AstraZeneca. Updated January 5 2021 https://www.gov.uk/government/publications/regulatory-approval-of-covid-19-vaccine-astrazeneca/information-for-healthcare-professionals-on-covid-19-vaccine-astrazeneca

11. Department of Health and Social Care. Press release. ‘Second COVID-19 vaccine authorised by medicines regulator’. December 30 2020. https://www.gov.uk/government/news/second-covid-19-vaccine-authorised-by-medicines-regulator

12. CDC. Information about the Moderna COVID-19 Vaccine. Updated January 1 2021. https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/Moderna.html

13. DHSC. Independent report. Joint Committee on Vaccination and Immunisation: advice on priority groups for COVID-19 vaccination, 30 December 2020. https://www.gov.uk/government/publications/priority-groups-for-coronavirus-covid-19-vaccination-advice-from-the-jcvi-30-december-2020/joint-committee-on-vaccination-and-immunisation-advice-on-priority-groups-for-covid-19-vaccination-30-december-2020

14. NHS. Letter. Publications approval reference C001559. December 30 2020. https://www.england.nhs.uk/coronavirus/wp-content/uploads/sites/52/2020/12/C0994-System-letter-COVID-19-vaccination-deployment-planning-30-December-2020.pdf

15. US Food & Drug Administration. Moderna COVID-19 Vaccine. Current as of January 4 2020. https://www.fda.gov/emergency-preparedness-and-response/coronavirus-disease-2019-covid-19/moderna-covid-19-vaccine

16. CDC. Moderna COVID-19 Vaccine. Page last reviewed: December 22, 2020. https://www.cdc.gov/vaccines/covid-19/info-by-product/moderna/index.html

17. CDC. Moderna COVID-19 Vaccine. Vaccine Preparation and Administration Summary. December 30 2020.  https://www.cdc.gov/vaccines/covid-19/info-by-product/moderna/downloads/prep-and-admin-summary.pdf

18. JR Su et al. ‘Anaphylaxis after vaccination reported to the Vaccine Adverse Event Reporting System, 1990-2016’. The Journal of Allergy and Clinical Immunology. April 1 2019. 143;4:1465-1473. https://www.jacionline.org/article/S0091-6749(19)30020-X/fulltext

19. MHRA. Press release. ‘Confirmation of guidance to vaccination centres on managing allergic reactions following COVID-19 vaccination with the Pfizer/BioNTech vaccine’. December 9 2020. https://www.gov.uk/government/news/confirmation-of-guidance-to-vaccination-centres-on-managing-allergic-reactions-following-covid-19-vaccination-with-the-pfizer-biontech-vaccine

20. J de Vrieze. ‘Suspicions grow that nanoparticles in Pfizer’s COVID-19 vaccine trigger rare allergic reactions’. AAAS. Science. December 21 2020. https://www.sciencemag.org/news/2020/12/suspicions-grow-nanoparticles-pfizer-s-covid-19-vaccine-trigger-rare-allergic-reactions