A contact-tracing app in Singapore that’s a key part of the government’s response to the coronavirus pandemic has helped to reduce the time taken to isolate contacts of a patient from four days to less than two, according to an engineer heading the project.

The TraceTogether program, which includes a mobile app and token, now covers 3.4 million users, about 60% of Singapore’s population, according to Jason Bay, the senior director who leads the project team at the Government Technology Agency.

While TraceTogether doesn’t generate as comprehensive a set of contacts as manual tracing, more than 10% of contacts identified turned positive during quarantine, showing the technology’s potential, Bay said at a conference.

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