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Table 1 Clinical staging of syndrome associated with COVID-19 [11]

From: Incidence of adverse reaction of drugs used in COVID-19 management: a retrospective, observational study

Clinical stage Disease progression
1 Asymptomatic
2 Symptomatic, no pneumonia
3 Symptomatic, pneumonia
4 Symptomatic, pneumonia, requiring supplemental oxygen
5 Critically ill with multi-organ involvement
  1. Adapted from Ministry of Health, Malaysia