1. WHO declares a pandemic of coronavirus disease covid-19. The Washington Post. 2020; Available at: https://www.washingtonpost.com/health/2020/03/11/who-declares-pandemic-coronavirus-disease-covid-19/. Accessed 25 March 2020.
2. Novel Coronavirus (2019-nCoV) situation reports. Available at: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports. Accessed 30 March 2020.
3. Tracking SARS-CoV-2 variants. Available at: https://www.who.int/en/activities/tracking-SARS-CoV-2-variants/. Accessed 17 September 2021.
4. Multiple SARS-CoV-2 variants escape neutralization by vaccine-induced humoral immunity
5. Superspreading and the effect of individual variation on disease emergence