1.Hospitalized adult (age ≥ 18), of any gender, with confirmed SARSCoV-2 infection with an oxygen saturation (SaO2) of 94% or less while they were breathing ambient air, or a ratio of the partial pressure of oxygen (PaO2) to the fraction of inspired oxygen (FiO2) of less than 300 mm Hg. 2.Diagnosed with SARS-CoV-2 infection, according to the following criteria: −Demonstration of SARS-CoV-2 RNAemia in nasopharyngeal swap or bronchio-alveolar lavage (BAL) (the test that will be used for SARSCoV-2 RNAemia is certified with the CE mark and will be used within the scope of its intended purpose) −Pneumonia confirmed by chest imaging (ultrasound, X-ray, CT, etc.) 3.Dated and signed informed consent from patient.

1.Hospitalized adult (age ≥ 18), of any gender, with confirmed SARSCoV-2 infection with an oxygen saturation (SaO2) of 94% or less while they were breathing ambient air, or a ratio of the partial pressure of oxygen (PaO2) to the fraction of inspired oxygen (FiO2) of less than 300 mm Hg. 2.Diagnosed with SARS-CoV-2 infection, according to the following criteria: −Demonstration of SARS-CoV-2 RNAemia in nasopharyngeal swap or bronchio-alveolar lavage (BAL) (the test that will be used for SARSCoV-2 RNAemia is certified with the CE mark and will be used within the scope of its intended purpose) −Pneumonia confirmed by chest imaging (ultrasound, X-ray, CT, etc.) 3.Dated and signed informed consent from patient.