Patients grouped into two categories upon admission: those with an upper respiratory tract infection (URTI), and those with a lower respiratory tract infection (LRTI).

The time between the onset of symptoms and admission, and the time between the onset of symptoms and treatment was documented. Risk factors for severe COVID-19 were also documented.

The national early warning score (NEWS) for patients was also collected upon admission and during follow ups. Three risk categories for clinical deterioration were defined: low score (NEWS 0–4), medium score (NEWS 5–6), and high score (NEWS≥7) for COVID patients.

Lastly, the need for oxygen therapy, transfer to the intensive care unit (ICU), death, and length of stay in the ID ward were documented.