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

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. "Wearable sensor technology can enable Covid-19 detection during the presymptomatic period," the researchers concluded. The findings were published in the journal BMJ Open.