1. World Health Organization. WHO coronavirus disease (COVID-19) dashboard. 2021. https://covid19.who.int/ (accessed August 9, 2021)
2. Spinelli MA, Glidden DV, Gennatas ED, Bielecki M, Beyrer C, Rutherford G, Chambers H, Goosby E, Gandhi M. Importance of non-pharmaceutical interventions in lowering the viral inoculum to reduce susceptibility to infection by SARS-CoV-2 and potentially disease severity. Lancet Infect Dis 2021; 21(9): e296–e301
3. World Health Organization. Draft landscape of COVID-19 candidate vaccines. 2021. https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines/ (accessed August 9, 2021)
4. National Medical Products Administration. Vaccine gets conditional approval for general use. 2021. http://subsites.chinadaily.com.cn/nmpa/2021-01/04/c_579626.htm (accessed August 9, 2021)
5. Sinovac. Sinovac receives conditional marketing authorization in China for its COVID-19 vaccine. 2021. http://www.sinovac.com.cn/news/shownews.php?id=1153&lang=en (accessed August 9, 2021)