That puts it at odds with the NHS app, which instead relies on users self-diagnosing via an on-screen questionnaire.

UK health chiefs have said the questionnaire is a key reason they are pursuing a "centralised" design despite privacy campaigners' protests.

Germany ditched that model in April.

And on Wednesday Chancellor Angela Merkel said there would be a "much higher level of acceptance" for a decentralised approach, which is designed to offer a higher degree of anonymity.

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