Pregnant women Breastfeeding women People with decreased level of consciousness Blood pressure less than 60/90 mm Hg Respiratory rate above 24 hypoxia Reduction of saturation less than 90% Patients with various organ failure Patients required mechanical ventilation at the time of admission

Pregnant women Breastfeeding women People with decreased level of consciousness Blood pressure less than 60/90 mm Hg Respiratory rate above 24 hypoxia Reduction of saturation less than 90% Patients with various organ failure Patients required mechanical ventilation at the time of admission