Before revision:  Besides voluntary reports of the infectious health status, our algorithm requires the location information of an overwhelming part of the population and then guarantees that almost all SARS-CoV-2 infections in that closed population can be detected.
After revision:  Besides voluntary reports of the infectious health status, our algorithm requires the location information of an overwhelming part of the population and then guarantees that almost all SARS-CoV-2 infections of the group of users can be detected.