• have tested positive for SARS-CoV-2 and discharged from the ICU or, - have tested positive for SARS-CoV-2 and have been discharged from hospital or, - have tested positive for SARS-CoV-2 but was NOT hospitalized - ages 18 and over, and - competent and willing to sign informed consent and comply to all aspects of the protocol CONTROL Inclusion Criteria - No clinical history of COVID-19, - No active clinical symptoms indicative of possible COVID-19, - Ages 18 and over, - competent and willing to sign informed consent and comply to all aspects of the protocol

• Participants cannot sign consent Any individual who meets any of the following criteria will be excluded from participation to the MRI or x-ray portion of the study: - Participants who are pregnant or currently trying to get pregnant - Participants unable to comply with any portion of the protocol (i.e. removing metals prior to entering the MRI scan room) or who have contraindications to MRI scanning (i.e., non-MRI-conditional pacemakers/defibrillators, pregnancy, ferromagnetic implants such as aneurysm clips, surgical clips, prostheses, artificial hearts, valves with steel parts, metal fragments, shrapnel, tattoos near the eye, or steel implants) - Persistent symptoms related to COVID-19 (in which case the patient may be re-screened later) As is done for all patients undergoing clinical MRI in our department, each patient will be screened for contraindications to MRI with a routine questionnaire prior to scanning. CONTROL Exclusion Criteria Patients with any of the following are excluded from as controls: - Pace maker - Poorly controlled diabetes - Poorly controlled Restrictive lung disease - Heart failure - Parkinson's Disease - Hypertension - Any diagnosis or history of autonomic neuropathy