Stock Photo - 22 September 2020, Berlin: A woman holds a smartphone with the Corona warning app indicating an ""increased risk"". The app, which was introduced 100 days ago on 16.6.2020, has now been downloaded over 18.2 million times. (to ""100 days Corona-Warn-App: The big test is still to come"") Photo: Christoph Dernbach/dpa. - Berlin/Berlin/Germany

Stock Photo: 22 September 2020, Berlin: A woman holds a smartphone with the Corona warning app indicating an ""increased risk"". The app.

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