Inclusion Criteria:  Males and females of age ≥ 18 years and ≤ 80 years Signed an Informed Consent Agree to undergo blood tests as per protocol Diagnosed with COVID-19 Evidence of lung involvement (by chest X rays or lung US) May or may not need for Supplemental Oxygen at enrollment Hospitalized  Exclusion Criteria:  Pregnant or breast-feeding females Patients with non-COVID19 related Pneumonia Any pulmonary disease not related to COVID19 Tracheostomy High flow oxygen or non-invasive ventilation (Bipap) or Mechanical ventilation Hypercalcemia defined as calcium or corrected calcium > 10.5mg/dL Hyperphosphatemia defined as > 4.5mg/dL Urine calcium to creatinine ratio >0.14 Participating in another clinical study