Is "mild" vs. "severe" dichotomous? I feel like I've usually seen the trichotomy of "mild" => not needing hospitalization, "moderate" => needing hospitalization, "severe" => needing ICU treatment.
> The largest cohort of >44,000 persons with COVID-19 from China showed that illness severity can range from mild to critical38:
> * Mild to moderate (mild symptoms up to mild pneumonia): 81%
> * Severe (dyspnea, hypoxia, or >50% lung involvement on imaging): 14%
> * Critical (respiratory failure, shock, or multiorgan system dysfunction): 5%