Covid19 Tracking?

Wrist-worn health trackers can spot Covid19 infections, days before the symptoms become apparent to the patient or to a doctor (https://www.theguardian.com/world/2022/jun/21/wrist-worn-trackers-can-detect-covid-before-symptoms-study-finds). The health trackers monitor skin temperature, as well as heart and breathing rates. It's suggested that, combining the health trackers with artificial intelligence systems, would be a very effective and inexpensive way of rapidly diagnosing Covid19 infections.