A) Chronological representation of the respiratory course and respiratory exams performed. ARDS: Acute Respiratory Distress Syndrome, BAL: bronchoalveolar lavage, CT: computed tomography, RT-PCR: reverse-transcriptase polymerase chain reaction for SARS-CoV-2, serology: specific-SARS-CoV-2 serology, VV-ECMO: veno-venous extracorporeal membrane oxygenation, WLL: whole lung lavage. Violet legend: analyses realized retrospectively (after COVID-19 diagnosis). B) First chest computed tomography (day-1). C) Second chest computed tomography (day-28). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)