Table 2.
COVID-19 clinical presentation.
| Asymptomatic infection | No clinical or radiological signs of COVID-19, positive PCR or antigen test |
| Mild infection | Upper respiratory tract infection symptoms—fever; flu-like symptoms—myalgia, joint pain, fever, cough, sneezing, running nose, abdominal discomfort/pain, anosmia, ageusia, no radiological signs of disease |
| Moderate infection | Upper and lower respiratory tract infection signs with possible wheezing, crackles, dyspnea with oxygen saturation < 94% on air, radiological signs of disease (X-ray or computed tomography) without other vital signs of deterioration |
| Severe infection | Dyspnea, tachypnea, hypoxemia (oxygen saturation < 94% on air) + radiological findings (in over 50% of lung tissue) |
| Critical infection | ARDS, encephalopathy, coagulopathy, acute renal failure, heart failure, shock, multiorgan failure + radiological findings |