https://techcrunch.com/2020/06/09/apple-adds-anonymous-symptom-and-health-info-sharing-to-its-covid-19-app-and-website/

Apple has updated its own COVID-19 iOS app and website with new features to allow users to anonymously share info including their age, existing health conditions, symptoms, potential exposure risks and the state in which they’re located. This info, which is not associated with any of their personal identifying data in any way according to the company, will be used in an aggregated way to help inform the Centers For Disease Control and Prevention (CDC) and improve the organization’s COVID-19 screening protocol.

The app will also use the aggregated data to assist public health agencies and the CDC in their efforts to help the public with the best available information about potential risk factors around COVID-19, and around what constitutes exposure and exposure risk.