Study: smartwatches like Apple Watch and Fitbit, which can measure heart rate variability, could help detect COVID-19 at least a week before symptoms appear (Megan Cerullo/CBS News)

Megan Cerullo / CBS News:
Study: smartwatches like Apple Watch and Fitbit, which can measure heart rate variability, could help detect COVID-19 at least a week before symptoms appear  —  Smartwatches and other wearable devices that continuously measure users' heart rates, skin temperature and other physiological markers …

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