1. World Health Organization. WHO Director-General's remarks at the media briefing on 2019-nCoV on 11 February 2020 2020 [Available from: https://www.who.int/dg/speeches/detail/who-director-general-s-remarks-at-the-media-briefing-on-2019-ncov-on-11-february-2020.
2. World Health Organization. WHO Director-General's statement on IHR Emergency Committee on Novel Coronavirus (2019-nCoV) 2020 [Available from: https://www.who.int/dg/speeches/detail/who-director-general-s-statement-on-ihr-emergency-committee-on-novel-coronavirus-(2019-ncov)) Accessed 23 July 2020.
3. WHO Coronavirus Disease (COVID-19) Dashboard 2020 [Available from: https://covid19.who.int. Accessed 23 July 2020.
4. Thanh Le T, Andreadakis Z, Kumar A, Gomez Roman R, Tollefsen S, Saville M, et al. The COVID-19 vaccine development landscape. Nat Rev Drug Discov. 2020;19(5):305–6.
5. Ministry of Health (MOH). COVID-19 Vaccines. Available online: https://covid19awareness.sa/en/archives/10691 (accessed on 27 June 2021).