Germany's new coronavirus smartphone app has been downloaded 9.6 million times since it was launched on Tuesday, according to government spokeswoman Ulrike Demmer.
That’s the equivalent of about 12% of the country’s population, although it’s unknown whether some people have downloaded it on multiple phones.
The new tracing app is designed to speedily track down new clusters of coronavirus infections.
Software maker SAP and telecommunications company Deutsche Telekom helped develop the service on behalf of the German government.
In countries around the world, many of these apps have been delayed as governments struggle to roll out complex new systems in record time, and some of those that have been launched are not being downloaded by enough people to have a major effect.
The UK yesterday ditched its own virus app for a version based on a system created by Google and Apple.