Apple Watch Vitals app predicts colds, flu, COVID days before they hit, users claim
Briefly

If multiple metrics are outside your typical range, you receive a notification along with context for factors that may be involved - like medications, elevation changes or illness, for example.
The Vitals app knew I was sick 3 days before I did, capturing three outliers within the person's wrist temperature that can be viewed on iPhones and iPads.
I started using Vitals when it first came out on beta and since then I've gotten sick about twice, both times it knew a couple days in advance.
Read at New York Post
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