The latest version of iOS, released today, includes a new system for tracking and notifying users that have been exposed to COVID-19. iOS 13.7 now drops the need for public health officials to maintain an app for exposure tracking. Instead, the system is baked directly into iOS 13.7.
https://www.notebookcheck.net/Built-in-COVID-19-tracking-tool-comes-to-iPhones-with-iOS-13-7.491250.0.html