Both H1N1 and SARS-CoV-2, two primarily respiratory viruses, resulted in many cases of patients with Acute Respiratory Distress Syndrome (ARDS). ARDS according to the Berlin Criteria (2012), is defined as respiratory distress of acute onset (within a week of a clinical incident), with diffuse lung infiltrates on chest X-ray, without underlying cardiac failure or abnormally positive fluid balance. The activation and dysregulation of multiple pathways of injury and inflammation, including coagulation, are the main constituents of ARDS pathophysiology 3 . Also, partial pressure of oxygen in the arterial blood to the fraction of inspired oxygen concentration PaO 2 /FiO 2 should be ≤300 4 . Causes of ARDS are divided into pulmonary, which could be respiratory tract infection or lung injury, and extrapulmonary, like burns, prior non-thoracic operation, extrapulmonary infection etc. In terms of hospital mortality, it is 34.9% for mild disease, 40.3% for moderate, and 50.4% for severe ARDS5. Finally, ARDS is the primary cause of Intensive Care Unit (ICU) admissions.According to the World Health Organization (WHO), risk factors for worse prognosis for H1N1 virus disease are young