Via Stanford University:
‘Our goal is to learn and predict which geographical areas will be most impacted by coronavirus based on how you are feeling. This information will be used to inform local and national responses, such as redirecting medical resources or improving policies and public guidance. Given the 9-10 day delay between onset of symptoms and hospitalization, and the 20% hospitalization rate of patients, tools like this will be necessary to truly track and fight the spread.
Your involvement will hopefully help save lives….’