Table 2  Clinical features of patients with a varying degree of disease
Mild disease  Severe disease   Critical disease 
Dry Cough  Fever  Respiratory failure
Fever  Tachypnea  Fever
Sour throat  Dyspnea  Decreases blood oxygen saturation
With or without nasal congestion     Septic shock
Generalized body aches     Multiple organ failure
Headache      
Malaise and fatigue