Table 1.

Staging and clinical features of COVID-19 [32].

Clinical Staging	Clinical Manifestation
Asymptomatic	None
Mild	Acute upper respiratory tract infection with symptoms such as fever, fatigue, myalgia, dry cough, sore throat, runny nose, sneezing, and/or digestive symptoms presenting as nausea, vomiting, abdominal pain, and diarrhea
Moderate	Pneumonia with frequent fever, cough with no obvious hypoxemia, chest CT with lesions (ground glass appearance)
Severe	Pneumonia with hypoxemia (oxygen saturation < 92%)
Critical	ARDS, acute renal damage, possibly shock, encephalopathy, myocardial damage, heart failure, and coagulation dysfunction