Reported cases, as tracked by the CDC:
https://www.cdc.gov/coronavirus/2019-ncov/cases-in-us.html

And as reported independently by Johns Hopkins:
https://www.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6



CDC recommendations: How to prevent infection, what to do if you are sick.
https://www.cdc.gov/coronavirus/2019-ncov/about/steps-when-sick.html