Disease severity Use of standardized disease severity definitions, for example, as per World Health Organization–China Joint Mission100:• mild-to-moderate: non-pneumonia and mild pneumonia
• severe defined as tachypnea, oxygen saturation ≤93% at rest, or PaO2/FiO2 ratio <300 mm Hg
• critical respiratory failure requiring mechanical ventilation, septic shock, or other organ dysfunction or failure that requires intensive care
Patients can be stratified by:• Disease severity and presence of GI symptoms
• Disease severity and LFTs
Symptoms and their duration before development of a severe stage of the disease should be reported