https://techcrunch.com/2020/03/25/self-reporting-app-for-covid-19-symptoms-for-uk-research-sees-650k-downloads-in-24-hours/

One of the big challenges (among many) with the coronavirus pandemic is that overwhelmed health services do not always know how best to deploy the limited resources that they have to meet the demand of people falling ill with Covid-19. For example, we know that more ventilators and beds will be needed, but where specifically are the outbreaks happening and how can those local areas be served better?

Now, an app in the UK called the C-19 Covid Symptom Tracker, developed out of an unlikely corner of medical research — looking into the progression of medical conditions by tracking twins — is asking people to self-report their symptoms in an effort to start to gather more of that detail.