The purpose of this study is to gain a deeper understanding of how different people respond to COVID-19. Our hope is that, through this knowledge, the pace of research into new preventive and therapeutic treatments for COVID-19 and a better understanding of susceptibility and severity of the disease can be accelerated. This is accomplished by identifying a group of people who may have been exposed to, tested positive for, or recovered from COVID-19. Data will be shared with qualified external researchers working to develop preventive and therapeutic treatments for COVID-19. Before these data are shared, they will be de-identified (stripped of direct and indirect identifiers like name, place of birth, and so on) and aggregated with other data to protect the privacy of participants.