The primary endpoint is treatment failure rate in each treatment group, treatment failure being defined at Day 22 as: 1. Occurrence of SpO2 ≤93% within 10 days after Day 0, and/or 2. Use of home oxygen therapy within 22 days after Day 0, and/or 3. Unscheduled hospitalisation of more than 24 hours related to the infection within 22 days after Day 0.

The primary endpoint is treatment failure rate in each treatment group, treatment failure being defined at Day 22 as: 1. Occurrence of SpO2 ≤93% within 10 days after Day 0, and/or 2. Use of home oxygen therapy within 22 days after Day 0, and/or 3. Unscheduled hospitalisation of more than 24 hours related to the infection within 22 days after Day 0.