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

Gye, H. (2021, November 29). All adults to be offered booster jabs after 3 months, and over-12s to get second doses. Inews.Co.Uk. https://inews.co.uk/news/politics/covid-booster-jabs-to-be-offered-all-adults-after-3-months-and-over-12s-second-doses-1325151

Dean, N. E. (2021, September 21). Hmm okay. J&J two dose results are a bit more complicated, with different results globally versus within the US. https://t.co/prFUorU8LE [Tweet]. @nataliexdean. https://twitter.com/nataliexdean/status/1440318770665324560

simine vazire. (2021, August 27). Great to see numbers continuing to climb; seems like they’re climbing maybe as fast as supply allows! [Tweet]. @siminevazire. https://twitter.com/siminevazire/status/1431187367834972162

Michael McCarthy. (2021, August 27). #COVD19 vax rates are still increasing in Australia. The over 70s are approaching 90% with first doses. The red line is the rate for all people >=16. That should reach 60% soon. Https://t.co/NH3Q7jumgT [Tweet]. @mickresearch. https://twitter.com/mickresearch/status/1431185640884826112

Lawrence Gilder on Twitter. (n.d.). Twitter. Retrieved 15 November 2021, from https://twitter.com/LawrenceGilder/status/1449030844132298764

Measuring vaccine efficacy from population data. (n.d.). The Centre for Evidence-Based Medicine. Retrieved 29 October 2021, from https://www.cebm.net/covid-19/measuring-vaccine-efficacy-from-population-data/

magazine, H. L., Nature. (n.d.). Delaying a COVID Vaccine’s Second Dose Boosts Immune Response in the Elderly. Scientific American. Retrieved 30 May 2021, from https://www.scientificamerican.com/article/delaying-a-covid-vaccine-rsquo-s-second-dose-boosts-immune-response-in-the-elderly/

In-Depth: Delaying the second COVID-19 vaccine dose has benefits and drawbacks. (2021, May 20). KGTV. https://www.10news.com/news/in-depth/in-depth-delaying-the-second-covid-19-vaccine-dose-has-benefits-and-drawbacks

Céline Gounder, MD, ScM, FIDSA. (2021, April 9). 1/ To delay 2nd doses of the Pfizer and Moderna COVID vaccines (like the UK, Germany, & Canada)? Https://t.co/eeK0160OLG Or not to delay? Https://t.co/V6ptl7t08N That is the question. [Tweet]. @celinegounder. https://twitter.com/celinegounder/status/1380306862868852737

Saad-Roy, C. M., Morris, S. E., Metcalf, C. J. E., Mina, M. J., Baker, R. E., Farrar, J., Holmes, E. C., Pybus, O. G., Graham, A. L., Levin, S. A., Grenfell, B. T., & Wagner, C. E. (2021). Epidemiological and evolutionary considerations of SARS-CoV-2 vaccine dosing regimes. Science, 372(6540), 363–370. https://doi.org/10.1126/science.abg8663

Wilson, C. (n.d.). Is the UK right to delay the second dose of the covid-19 vaccines? New Scientist. Retrieved 20 January 2021, from https://www.newscientist.com/article/mg24933173-700-is-the-uk-right-to-delay-the-second-dose-of-the-covid-19-vaccines/