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Using data from a wearable, an algorithm could predict 68% of COVID cases two days before symptoms appeared What if a fitness tracker sitting on your wrist could detect COVID-19 before you even developed symptoms? An impressive new study claims this is not only possible, but preliminary investigations found infections can be detected nearly 48 hours before symptoms appear. The new research began in early 2020, soon after the pandemic kicked off. A team of researchers wondered whether data from a wrist-worm health tracker could be leveraged to pick up small changes in a person's vital signs that precede the onset of COVID-19. Using data from a wearable, an algorithm could predict 68% of COVID cases two days before symptoms appeared What if a fitness tracker sitting on your wrist could detect COVID-19 before you even developed symptoms? An impressive new study claims this is not only possible, but preliminary investigations found infections can be detected nearly 48 hours before symptoms appear. The new research began in early 2020, soon after the pandemic kicked off. A team of researchers wondered whether data from a wrist-worm health tracker could be leveraged to pick up small changes in a person's vital signs that precede the onset of COVID-19.