This COVID-19 tracker is brought to you by the Center for the Ecology of Infectious Diseases and the College of Public Health at the University of Georgia. It was developed by Robbie Richards, William Norfolk and Andreas Handel. Source code for this project can be found in this GitHub repository. We welcome feedback and feature requests, please send them as a GitHub Issue or contact Andreas Handel.
We currently include 4 different data sources for US states. The Covid Tracking Project data source reports all and positive tests, hospitalizations (some states) and deaths. We interpret positive tests as corresponding to new cases. The New York Times (NYT), USA Facts and Johns Hopkins University Center for Systems Science and Engineering (JHU) sources report cases and deaths.
For the county level plots, we use JHU data. (NY Times and USA Facts also provide data on the county level, however all 3 data sources are very similar and for speed/memory purposes we decided to only display one county level data source.)
World data comes from 2 different sources. One source is the Johns Hopkins University Center for Systems Science and Engineering (JHU) the other source is Our World in Data (OWID). Both sources provide case and death data, OWID also provides testing data for some countries. For OWID, we assume reported cases correspond to positive tests.
For more details on each data source, see their respective websites. Note that some data sources only report some data. Also, numbers might not be reliable. We do light cleaning (e.g. remove negative values), but otherwise just take the data from the sources and display it.
The Center for the Ecology of Infectious Diseases has several additional projects related to COVID-19, which can be found on the CEID COVID-19 Portal.
If you are interested in learning more about infectious disease epidemiology and modeling, check out our (slightly advanced) interactive modeling software and tutorial.

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