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The health ministry said Friday it has started issuing individual codes to people infected with the coronavirus, completing the rollout of its contact-tracing smartphone app.

Those who test positive will now be informed of their codes by their public health centers. When they enter the codes into the ministry’s Contact-Confirming Application, dubbed Cocoa, other users who potentially made close contact with them will be notified.

Notifications will be sent to users who spent at least 15 minutes within a meter of the infected patient within the previous 14 days.

The app will ask those notified by the app about their health and urge them to get tested. The data on the app is encrypted, ensuring others will not be able to directly identify patients.

“The whole system has started working,” health minister Katsunobu Kato said at a news conference, urging more to install the tracing app.

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