A. Cases: Patients with ALD and COVID-19 pneumonia: 1. Clinical, imaging, laboratory, and/or histological diagnosis of alcoholic cirrhosis and/or alcoholic hepatitis 2. Child Pugh score 5-8, serum creatinine <3, Model for End Stage Liver Disease score (MELD) <25 3. Diagnosis of COVID-19 pneumonia as defined by the WHO criteria: confirmed SARS-CoV-2 infection by PCR, evidence of bilateral pulmonary infiltrates on chest radiograph (CXR) or computed tomography (CT) and SpO2 <93% or on oxygen supplement 4. Age of 21 years or older B. Controls: Patients without alcoholic liver disease (Non-ALD) and COVID-19 pneumonia: 1. Diagnosis of COVID-19 pneumonia as defined by the WHO criteria: confirmed SARS-CoV-2 infection by PCR, evidence of bilateral pulmonary infiltrates on chest radiograph (CXR) or computed tomography (CT) and SpO2 <93% or on oxygen supplement 2. Age of 21 years or older

(Both Cases and Controls) 1. Patients requiring active ventilator support 2. Anticoagulant/antiplatelet therapy (for those in the biopsy arm, see Randomization schema. If clinically feasible, patients will be asked to hold their anticoagulants for the muscle biopsy after physician review), 3. Recent gastrointestinal bleeding (<3 months) 4. Advanced organ diseases: congestive heart failure (NYHA class 3 and 4), chronic obstructive pulmonary diseases (COPD) (GOLD stage 3 and 4), chronic kidney disease (Cr>3), metastatic malignancy 5. Medications that alter muscle protein metabolism except systemic corticosteroids 6. Pregnancy 7. Unwillingness/ Inability to sign informed consent