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Apple and Google have added a way to notify users about potential COVID-19 infections without them having to install an app. The Bluetooth-based system is coming to iOS and Android but will be opt-in only. Both companies have already built ... technologies that use Bluetooth to anonymously track which handsets have been in close proximity of a user who reports either symptoms or a positive test. However, until now the technologies have only been used through official government or health authority apps. Now the mobile operating systems are getting a built-in tool called Exposure Notifications ... (view more)