Inclusion Criteria:  Reverse transcription polymerase chain reaction (RT-PCR) / Rapid Ag test positive Signed informed consent Age ≥ 50 yrs Respiratory rate : 25 - 30/min, breathless AND/OR Oxygen saturation by pulse oximetry (SpO2) in 90 - 93% on room air (readings taken after 5 mins of stopping oxygen supplementation) Rising levels of quantitative-CRP and/or D-Dimer and/or Ferritin in 2 consecutive samples taken 24 hours apart  Exclusion Criteria:  Patient who have received vaccination for COVID-19 (single / both doses of any approved vaccine) Hemodynamic instability in shock and/or systolic BP < 90mm Hg Septicemia Disseminated intravascular coagulation Requiring ventilation Unable to lie down supine Severe acute respiratory distress with Fraction of inspired oxygen (FiO2) < 100mm Hg Cardiac defibrillator/pacemaker in situ Lymphocyte count < 1 x 106/ml Pregnancy and/or lactating mothers HIV and/or HbsAg positive patients