This story is part of an ongoing series on US-China relations, jointly produced by the South China Morning Post and POLITICO, with reporting from Asia and the United States.

Using an app on your smartphone to track whether you’ve been in close contact with people who have contracted Covid-19 seems – at first glance – like a perfectly plausible way to use new technology to help tackle a global health crisis that has sickened millions and brought the world economy to its knees.

There’s just one…



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