Inclusion Criteria:  Acute hypoxemic respiratory failure Positive SARS CoV-2 PCR on nasopharyngeal swab or distal airway sampling ICU admission during the hospital stay  Exclusion Criteria:  Chronic respiratory failure (Oxygen or NIPPV at home) Patients with "Do Not Resuscitate" order at ICU admission Admission from an other ICU with a stay > 2 days Transfer to an another ICU during the ICU stay