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Apple is working with researchers to see if devices like the Apple Watch and the iPhone are capable of detecting early signs of respiratory illnesses like the flu and COVID-19.
The study, which will last six months, will be conducted through the University of Washington and the Seattle Flu Study, according to an information page on the Seattle Flu Study website.
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Participants in the Seattle area will be given an Apple Watch and will have to answer short surveys on their iPhones every week.
The study was initially announced in September.