A Study to Look at the Health Outcomes of Patients With COVID-19 and Influenza.

The main purpose of this study is to understand: * the symptoms of COVID-19 or influenza * health-related outcomes of people with COVID-19 or influenza * the effects of vaccines in people with COVID-19 or influenza. This study will take in participants who are: * 18 years or older * reported to have symptoms with lab tests that have confirmed illness. The lab tests can be tested at any of Walgreens pharmacy COVID-19 or influenza test sites. The study will collect vaccine history information from participants who are ready to take part in the study. Participant will be emailed a form with questions about their health related to COVID-19 or influenza during twelve follow-ups over a 6-month period.