Here's an article discussing a feature for a smartphone that might alert you to a possible virus exposure:
https://www.washingtonpost.com/technology/2020/11/18/coronavirus-app-exposure-alerts/
This feature is available in Arizona. I got the app from Apple's App Store, and I installed it on my iPhone.
https://covid19.arizona.edu/covidwatch
I don't know much about this idea yet, but thought I'd give it a try, and I'll do some more reading about it.
Jim Hamm