LYT-100 in Post-acute COVID-19 Respiratory Disease

Key Inclusion Criteria: * Positive result of a molecular RT-qPCR diagnostic test or SARS-CoV-2 RNA result from a clinical specimen deemed clinically associated with the current episode of illness, warranting hospital admission as per investigator's judgement, or previously hospitalized (central and/or local laboratory COVID-19 test results are accepted from any biological material source) * Hospitalization for COVID-19 respiratory disease and treated with supplemental oxygen (including MV, ECMO or any other means of oxygen administration) in hospital for at least 1 day * COVID-19 pneumonia findings on imaging (chest X-ray or CT Scan) with a minimum of two lung lobes involvement * Able to bear weight and ambulate a minimum of 10 m distance (use of inhaled oxygen permitted) * Shortness of breath ≥ grade 3 on mBDS dyspnea scale and not requiring MV, ECMO, NIV, and/or HFNO (nasal O2 is allowed) for at least 72 hours before screening Key Exclusion Criteria: * Pre-existing chronic respiratory condition(s), obstructive or restrictive, for which the patient is actively taking concomitant medication are excluded. Patients with history of Idiopathic Pulmonary Fibrosis (IPF), lung cancer, pulmonary arterial hypertension, other interstitial lung diseases, severe cardiac insufficiency (grade IV) are excluded irrespective of whether they are actively being medicated for those conditions or not. * Pre-existing co-morbid conditions preventing outcome assessments, e.g., neurological, medical, orthopedic injury/disability, disease or condition that would prevent ability to transfer and walk for 6 minutes, prior to confirmed COVID-19 diagnosis * Unstable angina or myocardial infarction in the last month prior to screening * Patients on MV, ECMO, NIV, and/or HFNO within the last 72 hours prior to screening