Illustration by Alex Castro / The Verge

In the early days of the COVID-19 pandemic, smartwatch advocates and wearable tech companies thought the devices could help with illness detection. They wanted to flag people who might be sick with the disease using things like their heart rate and oxygen levels. The strategy could still be a reasonable way to track illness, but two years later, the promise hasn’t panned out — the research is still underdeveloped, according to a new review published last week in The Lancet.

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