Additional Study Information: We are seeking healthy volunteers and people who have tested positive for COVID-19 in the past. Our study is looking at how coronavirus affects the heart after recovery. If you enroll, you will be given an echocardiogram and a cardiac magnetic resonance imaging (MRI) scan, and you will be asked to provide a blood sample. An echocardiogram is a test that uses sound waves to get a picture of your heart. A cardiac MRI scan uses radio waves to get another kind of picture of your heart. For the MRI, you will receive an injection of a contrast agent, which is safe for qualified participants. There is no radiation involved in either test. If any abnormalities are found on either scan, we will notify your healthcare provider. The total duration of tests is 2 hours. This can be done in 1 or 2 study visits, whichever works best for your schedule. You will be compensated $100 after all tests are completed.