Composite: Change in severity and duration of symptoms; assessed by data linkage to patient medical records[once daily for 15 days since enrolment / baseline = admission to hospital];length of hospital stay = days discharge since hospital admissionassessed by data linkage to patient medical records[days in hospital since admission at hospital discharge];composite of need for invasive mechanical ventilation* or mortality within 15 days from enrolment assessed by data linkage to patient medical records*Participants intubated or requiring imminent intubation at the time of enrolment will only be followed for the primary outcome of death.[any time within 15 days from enrolment]

Composite: Change in severity and duration of symptoms; assessed by data linkage to patient medical records[once daily for 15 days since enrolment / baseline = admission to hospital];length of hospital stay = days discharge since hospital admissionassessed by data linkage to patient medical records[days in hospital since admission at hospital discharge];composite of need for invasive mechanical ventilation* or mortality within 15 days from enrolment assessed by data linkage to patient medical records*Participants intubated or requiring imminent intubation at the time of enrolment will only be followed for the primary outcome of death.[any time within 15 days from enrolment]