How can clinical epidemiology provide insight to improve COVID-19 patient and population outcomes?

How can clinical epidemiology provide insight to improve COVID-19 patient and population outcomes?
Identify one area (screening, diagnosis, or treatment) that is used in the management of COVID-19 in clinical settings.
After a brief review of the literature currently available on this topic, what is currently known about the area (screening, diagnosis, treatment) that you chose? Are there new developments in screening, diagnosis, or treatment? Provide a summary of the current epidemiological data.