My uncle was diagnosed with covid 2 months back. He was admitted and given steriods. He was diagnosed with viral pneumonia. He was administrated with remedesivir and faviflu as well. He was released after 20 days. Soon after his discharge, he started having persistent fever of about 99-100, o2 saturation of about 89 and CRP of about 8. His reports are clean. CT shows GGO formation. On movement the o2 even falls upto 73. Please suggest.