At a time when all the services of the National Health Service in each country are clogging up, I think it would be important to have an App to monitor people who may have symptoms, so that they can be more easily identified, and monitored and that their screening will be faster , and if justify making a call. As well as accompanying people who are alone or even elderly, so that these people can be monitored and the central services know that people are well, for example, they have to enter the App x in x time.
And here is a whole world of ideas that can be pulled out in order to help those who need it most and to relieve emergency medical services.