inclusion criteria: - patients admitted to hospital with covid-19 - no immediate requirement for mechanical ventilation (points 3-5 on the who ordinal scale) - age equal to or greater than 18 - able to provide informed consent

inclusion criteria: - patients admitted to hospital with covid-19 - no immediate requirement for mechanical ventilation (points 3-5 on the who ordinal scale) - age equal to or greater than 18 - able to provide informed consent