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How coronavirus contact tracing apps work

Photo: Courtesy

More than 20 countries and territories in Europe have launched or plan smartphone apps that seek to break the chain of coronavirus infection by tracking encounters between people and issuing a warning should one of them test positive.

Most countries in the region have opted to use Bluetooth short-range radio to monitor close encounters that could spread the disease, after concluding that tracking people’s movements using location data would be intrusive.

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