1.Change from baseline oxygen saturation after 48 hours post irradiation; Day 3 and Day 7 post RT <br/ >2.Time interval taken to reduce Oxygen demand upto 50% from baseline if on O2 support. <br/ >3.Overall mortality rate at 28 days post radiation. <br/ >4. CT severity score change from baseline on Day 7 to one week of post RT. <br/ >5. Number of hospital stay days: <br/ > Total number of days admitted in hospital after Radiotherapy <br/ >6. Number of intubation events: <br/ > Total number of intubation events after RadiotherapyTimepoint: 28 (±2)

1.Change from baseline oxygen saturation after 48 hours post irradiation; Day 3 and Day 7 post RT <br/ >2.Time interval taken to reduce Oxygen demand upto 50% from baseline if on O2 support. <br/ >3.Overall mortality rate at 28 days post radiation. <br/ >4. CT severity score change from baseline on Day 7 to one week of post RT. <br/ >5. Number of hospital stay days: <br/ > Total number of days admitted in hospital after Radiotherapy <br/ >6. Number of intubation events: <br/ > Total number of intubation events after RadiotherapyTimepoint: 28 (±2)

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1.Change from baseline oxygen saturation after 48 hours post irradiation; Day 3 and Day 7 post RT <br/ >2.Time interval taken to reduce Oxygen demand upto 50% from baseline if on O2 support. <br/ >3.Overall mortality rate at 28 days post radiation. <br/ >4. CT severity score change from baseline on Day 7 to one week of post RT. <br/ >5. Number of hospital stay days: <br/ > Total number of days admitted in hospital after Radiotherapy <br/ >6. Number of intubation events: <br/ > Total number of intubation events after RadiotherapyTimepoint: 28 (±2)

1.Change from baseline oxygen saturation after 48 hours post irradiation; Day 3 and Day 7 post RT <br/ >2.Time interval taken to reduce Oxygen demand upto 50% from baseline if on O2 support. <br/ >3.Overall mortality rate at 28 days post radiation. <br/ >4. CT severity score change from baseline on Day 7 to one week of post RT. <br/ >5. Number of hospital stay days: <br/ > Total number of days admitted in hospital after Radiotherapy <br/ >6. Number of intubation events: <br/ > Total number of intubation events after RadiotherapyTimepoint: 28 (±2)