Munro, A. P. S., Janani, L., Cornelius, V., Aley, P. K., Babbage, G., Baxter, D., Bula, M., Cathie, K., Chatterjee, K., Dodd, K., Enever, Y., Gokani, K., Goodman, A. L., Green, C. A., Harndahl, L., Haughney, J., Hicks, A., van der Klaauw, A. A., Kwok, J., … Appleby, K. (2021). Safety and immunogenicity of seven COVID-19 vaccines as a third dose (booster) following two doses of ChAdOx1 nCov-19 or BNT162b2 in the UK (COV-BOOST): A blinded, multicentre, randomised, controlled, phase 2 trial. The Lancet, S0140673621027173. https://doi.org/10.1016/S0140-6736(21)02717-3 s

Commissioner, O. of the. (2022). Comirnaty and Pfizer-BioNTech COVID-19 Vaccine. FDA. https://www.fda.gov/emergency-preparedness-and-response/coronavirus-disease-2019-covid-19/comirnaty-and-pfizer-biontech-covid-19-vaccine

Pozzetto, B., Legros, V., Djebali, S., Barateau, V., Guibert, N., Villard, M., Peyrot, L., Allatif, O., Fassier, J.-B., Massardier-Pilonchéry, A., Brengel-Pesce, K., Yaugel-Novoa, M., Denolly, S., Boson, B., Bourlet, T., Bal, A., Valette, M., Andrieu, T., Lina, B., … Trouillet-Assant, S. (2021). Immunogenicity and efficacy of heterologous ChadOx1/BNT162b2 vaccination. Nature, 1–9. https://doi.org/10.1038/s41586-021-04120-y

Andrews, N., Stowe, J., Kirsebom, F., Gower, C., Ramsay, M., & Lopez Bernal, J. (2021). Effectiveness of BNT162b2 (Comirnaty, Pfizer-BioNTech) COVID-19 booster vaccine against covid-19 related symptoms in England: Test negative case-control study [Preprint]. Epidemiology. https://doi.org/10.1101/2021.11.15.21266341

Zimmer, C. (2021, September 21). An extra J. & J. shot substantially boosts protection against Covid, the company reports. The New York Times. https://www.nytimes.com/2021/09/21/health/johnson-and-johnson-shot.html

Sandra Ciesek. (2021, December 8). Unsere ersten Daten zur Neutralisation von Omicron versus Delta sind fertig: 2x Biontech, 2x Moderna, 1xAZ/1x Biontech nach 6 Monaten 0% Neutralisation bei Omicron, auch 3x Biontech 3 Monate nach Booster nur 25% NT versus 95% bei Delta. Bis zu 37fache Reduktion Delta vs. Omicron https://t.co/w0gHww26sg [Tweet]. @CiesekSandra. https://twitter.com/CiesekSandra/status/1468465347519041539

Khairy Jamaluddin 🇲🇾🌺. (2021, November 14). Real world data from Chile has shown significant increase in vaccine effectiveness after a booster for people who took Sinovac for their primary series. Biggest boost came with a Pfizer booster. Other countries are also combining SSP. Take the booster when offered. Https://t.co/N98K1eEvTR [Tweet]. @Khairykj. https://twitter.com/Khairykj/status/1459800517635305474

Lewis, T. (n.d.). Who Needs a COVID Booster Shot? Experts Answer Common Questions. Scientific American. Retrieved April 29, 2022, from https://www.scientificamerican.com/article/who-needs-a-covid-booster-shot-experts-answer-common-questions/

Abu-Raddad, L. J., Chemaitelly, H., Ayoub, H. H., AlMukdad, S., Tang, P., Hasan, M. R., Coyle, P., Yassine, H. M., Al-Khatib, H. A., Smatti, M. K., Al-Kanaani, Z., Al-Kuwari, E., Jeremijenko, A., Kaleeckal, A. H., Latif, A. N., Shaik, R. M., Abdul-Rahim, H. F., Nasrallah, G. K., Al-Kuwari, M. G., … Bertollini, R. (2022). Effectiveness of BNT162b2 and mRNA-1273 COVID-19 boosters against SARS-CoV-2 Omicron (B.1.1.529) infection in Qatar (p. 2022.01.18.22269452). medRxiv. https://doi.org/10.1101/2022.01.18.22269452

Helen Branswell 🇺🇦 on Twitter. (n.d.). Twitter. Retrieved April 1, 2022, from https://twitter.com/HelenBranswell/status/1478835175580741633

ReconfigBehSci on Twitter: ‘RT @PeterHotez: I’m trying to reconcile Pfizer’s optimistic statements about 3rd dose protection against omicron https://t.co/mIWDowkDW6 v…’ / Twitter. (n.d.). Retrieved 29 March 2022, from https://twitter.com/SciBeh/status/1468568425308078088

Health, A. G. D. of. (2022, February 2). ATAGI recommendations for use of Pfizer COVID-19 vaccine as a booster dose in adolescents aged 16-17 years [Text]. Australian Government Department of Health; Australian Government Department of Health. https://www.health.gov.au/news/atagi-recommendations-for-use-of-pfizer-covid-19-vaccine-as-a-booster-dose-in-adolescents-aged-16-17-years

Walker, P., Sample, I., Stewart, H., & Adams, R. (2021, December 22). Vulnerable children aged 5-11 to be offered Covid jabs. The Guardian. https://www.theguardian.com/society/2021/dec/22/jcvi-set-to-recommend-vaccinating-vulnerable-five--to-11-year-olds

Devlin, H., & Kollewe, J. (2021, November 26). BioNTech says it could tweak Covid vaccine in 100 days if needed. The Guardian. https://www.theguardian.com/society/2021/nov/26/biontech-says-it-could-tweak-covid-vaccine-in-100-days-if-needed

FDA authorizes Pfizer-BioNTech, Moderna boosters for all adults. (2021). Washington Post. Retrieved November 22, 2021, from https://www.washingtonpost.com/health/2021/11/19/fda-clears-pfizer-biontech-moderna-booster-shots-all-adults/

Chise 🧬🧫🦠💉🔜 MFF. (2021, November 21). If you’re wondering what difference a booster makes. Https://t.co/858ZpST7Kh [Tweet]. @sailorrooscout. https://twitter.com/sailorrooscout/status/1462441020948459525

Reuters. ‘CDC Overrides Advisory Panel to Back Pfizer Booster for Americans with High-Risk Jobs’. The Guardian, 24 September 2021, sec. US news. https://www.theguardian.com/us-news/2021/sep/24/cdc-overrides-advisory-panel-pfizer-booster-americans-high-risk-jobs.

COVID-19 is here to stay, and Israel shows it’s going to take more than just booster shots to live with it. (2021, October 29). ABC News. https://www.abc.net.au/news/2021-10-30/israel-uses-booster-shots-masks-and-passports-against-covid/100569256

Gutman, R. (2021, October 14). Should You Mix and Match Your Booster Shot? The Atlantic. https://www.theatlantic.com/health/archive/2021/10/mix-match-booster-covid-vaccine/620395/

Pfizer Covid jab ‘90% effective against hospitalisation for at least 6 months’ | Coronavirus | The Guardian. (n.d.). Retrieved October 19, 2021, from https://www.theguardian.com/world/2021/oct/05/pfizer-covid-jab-90-effective-against-hospitalisation-for-at-least-6-months?CMP=Share_iOSApp_Other

Pfizer Covid jab ‘90% effective against hospitalisation for at least 6 months’ | Coronavirus | The Guardian. (n.d.). Retrieved October 8, 2021, from https://www.theguardian.com/world/2021/oct/05/pfizer-covid-jab-90-effective-against-hospitalisation-for-at-least-6-months

Flu and Covid jabs safe to be given at same time, study finds | Vaccines and immunisation | The Guardian. (n.d.). Retrieved October 1, 2021, from https://www.theguardian.com/society/2021/sep/30/flu-covid-jabs-safe-same-time-study?CMP=Share_iOSApp_Other

Mandavilli, Apoorva. “J.&J. Vaccine May Be Less Effective Against Delta, Study Suggests.” The New York Times, July 20, 2021, sec. Health. https://www.nytimes.com/2021/07/20/health/coronavirus-johnson-vaccine-delta.html.

Analysis: Pfizer/BioNTech bid for booster doses premature, more data needed -experts | Reuters. (n.d.). Retrieved July 19, 2021, from https://www.reuters.com/world/pfizerbiontech-bid-booster-doses-premature-more-data-needed-experts-2021-07-12/

the Guardian. ‘Pfizer Vaccine Has 91% Efficacy for up to Six Months, Trial Shows’, 1 April 2021. http://www.theguardian.com/world/2021/apr/01/pfizer-vaccine-has-91-efficacy-for-up-to-six-months-trial-shows.