Yes, you could ask them where are they from and have they recently visited any COVID19 affect country. We need to protect ourselves as well as our society.
You could find more suggestion regarding coronavirus in our Airbnb community kindly read those article also. We need to precaution in every step before we host some one to our property.
@Bernadette82 Almost anywhere is a potential COIV19 area now. It changes daily. I don't see the point of asking that question and how would you know they were telling the truth?
If you are feeling nervous about hosting, snooze your listing for awhile until we see how this plays out.