Inclusion Criteria:  Able to understand and willingness to comply with study procedures Inpatient Cases - hospitalized patients with positive COVID-19 PCR test, collected from a respiratory sample within the last 7 days, AND pulmonary symptoms within 72 hours of enrollment Outpatient Cases - participant being screened for COVID-19 with positive COVID-19 PCR test respiratory sample Controls - Outpatients with negative COVID-19 PCR test respiratory sample and no pulmonary diagnosis or symptoms Cases or Control not able to sit or stand will be allowed to participate in just the parts of the staircase exam they're capable of doing.  Exclusion Criteria:  Assisted ventilation, including high flow nasal cannula, or ventilator support Unable to comply with study procedures, defined at investigator's discretion Participants with any visible skin infections or open wounds in areas where the imPulse™ Una device would be applied