> This is completely useless as the 24hrs before symptoms start the patient is likely to already be highly infectious, and misses the asymptomatic carriers whi

> This is completely useless as the 24hrs before symptoms start the patient is likely to already be highly infectious, and misses the asymptomatic carriers which have an indeterminate effect on spread as well. Nothing is a one-shot-solve-all solution to Covid. If Apple watches can detect it and prompt people to go get a full test, that’s great. I’ve got an ongoing theory that a lot of the spread is by people who ignore their symptoms because ‘they have a cough but it’s not a covid cough’ or ‘they haven’t lost their smell so it can’t be covid’ so the more things that can prompt you to get a test and isolate the better.