Age 30- 60 years old Serum Vitamin D level lower than 30 nanograms per milliliter Cases who diagnosed as novel coronavirus 2019 infection by clinical features (sore throat, dry cough, dyspnea), laboratory findings (positive C- Reactive protein, lymphocyte<1100 per mililiter), or radiological findings (lung patchy infiltrations in chest X-ray or CT scan)

Age 30- 60 years old Serum Vitamin D level lower than 30 nanograms per milliliter Cases who diagnosed as novel coronavirus 2019 infection by clinical features (sore throat, dry cough, dyspnea), laboratory findings (positive C- Reactive protein, lymphocyte<1100 per mililiter), or radiological findings (lung patchy infiltrations in chest X-ray or CT scan)