[1] International Olympic Committee, Playbook for athletes. IOC, 2021. https://stillmed.olympics.com/media/Documents/Olympic-Games/Beijing-2022/Playbooks/The-Playbook-Athletes-and-Team-Officials-December-2021.pdf?_ga=2.199131626.472829758.1643264110-1312700856.1622511275. [2021-10-22].https://stillmed.olympics.com/media/Documents/Olympic-Games/Beijing-2022/Playbooks/The-Playbook-Athletes-and-Team-Officials-December-2021.pdf?_ga=2.199131626.472829758.1643264110-1312700856.1622511275
[2] Aschwanden C. Five reasons why COVID herd immunity is probably impossible. Nature 2021;591(7851):520 − 2. http://dx.doi.org/10.1038/d41586-021-00728-2CrossRef
[3] Buss LF, Prete Jr CA, Abrahim CMM, Mendrone Jr A, Salomon T, De Almeida-Neto C, et al. Three-quarters attack rate of SARS-CoV-2 in the Brazilian Amazon during a largely unmitigated epidemic. Science 2021;371(6526):288 − 92. http://dx.doi.org/10.1126/science.abe9728CrossRef
[4] Brown CM, Vostok J, Johnson H, Burns M, Gharpure R, Sami S, et al. Outbreak of SARS-CoV-2 infections, including COVID-19 vaccine breakthrough infections, associated with large public gatherings-barnstable county, massachusetts, July 2021. MMWR Morb Mortal Wkly Rep 2021;70(31):1059 − 62. http://dx.doi.org/10.15585/mmwr.mm7031e2CrossRef
[5] Guerra FM, Bolotin S, Lim G, Heffernan J, Deeks SL, Li Y, et al. The basic reproduction number (R0) of measles: a systematic review. Lancet Infect Dis 2017;17(12):e420 − 8. http://dx.doi.org/10.1016/S1473-3099(17)30307-9CrossRef
[6] Hao XJ, Cheng SS, Wu DG, Wu TC, Lin XH, Wang CL. Reconstruction of the full transmission dynamics of COVID-19 in Wuhan. Nature 2020;584(7821):420 − 4. http://dx.doi.org/10.1038/s41586-020-2554-8CrossRef
[7] Ahammed T, Anjum A, Rahman MM, Haider N, Kock R, Uddin MJ. Estimation of novel coronavirus (COVID-19) reproduction number and case fatality rate: a systematic review and meta-analysis. Health Sci Rep 2021;4(2):e274. http://dx.doi.org/10.1002/hsr2.274CrossRef
[8] Tokyo Metropolitan Government, Updates on COVID-19 in Tokyo. 2021. https://stopcovid19.metro.tokyo.lg.jp/en/monitoring. [2021-10-22].
[9] Sparrow AK, Brosseau LM, Harrison RJ, Osterholm MT. Protecting olympic participants from covid-19—the urgent need for a risk-management approach. N Engl J Med 2021;385:e2. http://dx.doi.org/10.1056/NEJMp2108567CrossRef