inclusion criteria: * aged ≥ 18 years, * admitted to icu within 72 hours, * having confirmed or highly suspected covid-19 infection (positive rt-pcr and/or computed tomography), * having acute hypoxemic respiratory failure with a \[pao2/fio2\] ratio between 100 mmhg and 300 mmhg, * having given free and informed written consent, * being affiliated with or benefiting from a social security scheme.

inclusion criteria: * aged ≥ 18 years, * admitted to icu within 72 hours, * having confirmed or highly suspected covid-19 infection (positive rt-pcr and/or computed tomography), * having acute hypoxemic respiratory failure with a \[pao2/fio2\] ratio between 100 mmhg and 300 mmhg, * having given free and informed written consent, * being affiliated with or benefiting from a social security scheme.

inclusion criteria: - aged ≥ 18 years, - admitted to icu within 72 hours, - having confirmed or highly suspected covid-19 infection (positive rt-pcr and/or computed tomography), - having acute hypoxemic respiratory failure with a [pao2/fio2] ratio between 100 mmhg and 300 mmhg, - having given free and informed written consent, - being affiliated with or benefiting from a social security scheme.

inclusion criteria: - aged ≥ 18 years, - admitted to icu within 72 hours, - having confirmed or highly suspected covid-19 infection (positive rt-pcr and/or computed tomography), - having acute hypoxemic respiratory failure with a [pao2/fio2] ratio between 100 mmhg and 300 mmhg, - having given free and informed written consent, - being affiliated with or benefiting from a social security scheme.