Although this article is specifically about the Ava bracelet, the research would appear to potentially be of interest to Apple Watch owners. Especially if temperature sensing is added at some point. (It does look as if wrist skin temperature is an important part of the detection/analysis.)
https://www.theguardian.com/world/2...-can-detect-covid-before-symptoms-study-finds
Link to paper published in BMJ Open:
https://bmjopen.bmj.com/content/12/6/e058274
Wrist-worn trackers can detect Covid before symptoms, study finds
Sensor tech can alert wearer to Covid early, helping to prevent onward transmissionhttps://www.theguardian.com/world/2...-can-detect-covid-before-symptoms-study-finds
Link to paper published in BMJ Open:
https://bmjopen.bmj.com/content/12/6/e058274