Wrist-worn trackers can detect Covid before symptoms, study finds

Sensor tech can alert wearer to Covid early, helping to prevent onward transmission

Health trackers worn on the wrist could be used to spot Covid-19 days before any symptoms appear, according to researchers.

Growing numbers of people worldwide use the devices to monitor changes in skin temperature, heart and breathing rates. Now a new study shows that this data could be combined with artificial intelligence (AI) to diagnose Covid-19 even before the first tell-tale signs of the disease appear.

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