In a nutshell, fire up Siri and ask:

Do I have coronavirus?

Siri will respond by running you through the current CDC protocol, asking about fever, dry cough, and exposure to other COVID-19 cases.

Works on HomePod Siri as well.

Interestingly, if you ask Siri if you have the Chinese virus, Siri will correct you, lead you down the path to learning about coronavirus.