All COVID-19 data is sourced from the COVID Tracking Project and the European Centers for Disease Control. The shapefile for the United States was created by Esri using data from ArcUSA, the U.S. Census, Esri, and the USDA. The shapefile for the world was obtained from thematticmapping.org. Plots are updated every day at 7 PM MDT, to take advantage of the regular updates to the data stores.
Due to the incomplete testing and reporting regimens in various countries, the data will at times be incomplete, resulting in strange-looking plots.