1. Coronavirus Disease (COVID-19) Weekly Epidemiological Update and Weekly Operational Update (World Health Organization, 2020); https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situation-reports
2. Ferguson, N. et al. Report 9: Impact of Non-Pharmaceutical Interventions (NPIs) to Reduce COVID19 Mortality and Healthcare Demand (Imperial College London, 2020). https://doi.org/10.25561/77482
3. Coronavirus in the U.S.: latest map and case count. New York Times (continuously updated); https://www.nytimes.com/interactive/2020/us/coronavirus-us-cases.html
4. The COVID Tracking Project (The Atlantic Monthly Group, 2020); https://covidtracking.com
5. Gottlieb, S. & Strain, M. R. Want schools to open? Get serious about outbreaks. Wall Street Journal https://www.wsj.com/articles/want-schools-to-open-get-serious-about-outbreaks-11596396822 (2 August 2020).