1.History of hypersensitivity to interferon or Novaferon or any excipients of interferon or Novaferon.2.Having received other antiviral treatments (Favipiravir, Remdesivir, interferon, etc.)3.CTCAE Grade 3 or higher liver dysfunction (ALT / AST> 5ULN) or renal dysfunction (eGFR <30 mL / min / 1.73 m2)4.Active infections or other medical conditions that contraindicate inhalation therapy

1.History of hypersensitivity to interferon or Novaferon or any excipients of interferon or Novaferon.2.Having received other antiviral treatments (Favipiravir, Remdesivir, interferon, etc.)3.CTCAE Grade 3 or higher liver dysfunction (ALT / AST> 5ULN) or renal dysfunction (eGFR <30 mL / min / 1.73 m2)4.Active infections or other medical conditions that contraindicate inhalation therapy