Is there a hosted feature layer for this? CDC has a map, but only offers JSON data, not unique by county.
https://www.cdc.gov/coronavirus/2019-ncov/your-health/covid-by-county.html
Levels defined here:
https://www.cdc.gov/coronavirus/2019-ncov/science/community-levels.html
The Living Atlas has you covered!
https://kendall.maps.arcgis.com/home/item.html?id=628578697fb24d8ea4c32fa0c5ae1843#overview