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"Digital contact tracing" uses technology to figure out who else may have been exposed to someone with an infectious disease. Think of it as a next step to the investigative contact tracing that's been around for many, many years.
Google and Apple recently announced they are working on updates to their smartphone operating systems — Android and iOS — that would allow approved apps from government health agencies to use Bluetooth to track proximity between different users and their devices.
But there are pros and cons.
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