My primary data site: https://www.worldometers.info/coronavirus/ . Initial page is world data; click on “USA” in the table to get to US data. Data is updated real-time; “days” are defined by Greenwich Mean Time. Therefore, to get a full day’s data, click on “Yesterday” at the top of the table. Note that data is on the site for at most 2 days past (countries) or 1 day past (USA and other countries), so you will need to make screen captures if you wish to review data over time. Also, the site has occasionally updated data for prior periods; for example, when New Jersey reported additional COVID-19 deaths based on probable “excess deaths” not previously attributed to COVID-19, the site spread the data historically over the pandemic. This then invalidates the New Jersey data in previous screen captures. In this situation, I added the newly reported New Jersey deaths to the day they were reported in order to maintain consistency with the US data I had previously collected. The site has now added 5 charts after the by-state table: total cases, daily new cases, active cases, total deaths, and active deaths. It is therefore now possible to read these charts with your cursor to get the latest data spanning back to the beginning of the pandemic. I have chosen not to update my tables with this information because of the unknown nature of future changes and because it would create inconsistencies with the prior analysis displayed on this site; adding changes to the day reported avoids such inconsistencies.

Central US government data source: https://www.cdc.gov/coronavirus/2019-ncov/index.html . It’s worth clicking around the CDC site – for example, there is a projection of US hospitalizations under a variety of models and tracking of “excess deaths” in 2020 versus an average of recent years. Also, the link above is to just the CDC COVID-19 data; here is the link to CDC data on a wide variety of medical conditions: https://www.cdc.gov/az/a.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Faz%2Findex.html .

Links to each state’s COVID-19 information resource page are given in the following article: https://www.usnews.com/news/best-states/articles/state-coronavirus-resources .

A great site for graphic representation of data: https://www.domo.com/covid19/daily-pulse/ . This site is well-maintained and frequently updated. Visualization is an excellent method of grasping data implications quickly.

The key management tool – R0: https://rt.live/ . R0 is the virus reproduction rate; if R0 is consistently held below 1, the virus eventually dies out. This site gives daily, graphic info on all 50 states. Update: This site has ceased real-time calculations as of January 26, 2021. It now provides links to other data sources and an Excel spreadsheet of its previous calculations.