TABLE 3.

Major forms of the clinical severity of COVID-19 infection [77].

Types	Common symptoms
Mild	• non-pneumonia and mild pneumonia; seen in 81% of cases
Severe	• dyspnea
	• respiratory frequency ≥30/min
	• blood oxygen saturation (spo2) ≤ 93%
	• blood gas: pao2 < 60 mm hg, paco2 > 50 mmhg
	• prolonged prothrombin time and high level of D-dimer
	• rhabdomyolysis
	• elevated level of liver enzyme, (e.g. alanine aminotransferase (ALT))
Critical	• respiratory failure that wants mechanical ventilation
	• septic shock
	• severe pulmonary infection
	• multiple organ dysfunction (MOD)