Our kid has a friend and ex co-worker who works in Chandler, AZ. Right there next door to Gilbert. In addition, these workers in Chandler had workers and managers travel to and from Mountain View, CA, another location with a significant Chinese population (pretty much all of Silicon Valley, really).
This friend was really ill a week or so before Christmas. Healthy young man who went to the gym a lot like our kid (at the time). Came down with something nasty, leaving him with serious breathing issues. Of course, it was written off at the time as the "flu" (not sure if this individual was ever tested for the flu).
Unfortunately, this individual likely passed this on to our kid, who was ill around Christmas Eve and Day. Of course, our kid stayed with us for 36 hours, sleeping over Christmas Eve. A day or two before the end of the year, my wife came down with something that decked her for close to a week, and left her energy-less for at least two weeks.
Whatever it was, it was contagious and nasty.
I would be willing to guess that a great portion of the population has or will show a positive for the COVID-19.
I felt very unwell early this year and didn’t think much of it.