1. Patients less than 18 years of age. <br/ >2. Patience who have taken high dose vitamin D (i.e.60,000 IU of Vitamin D) In the last 3months either daily, Weekly or monthly or whose 25 (OH) D level is above 30 ng/ml. <br/ >3. Refusal to participate expressed by patient or legally authorised representative if they are present. Refusal to sign the informed Consent form. <br/ >4. Patients of category 4, 5, 6 ( ARDS, Sepsis, Septic Shock) Respectively as a defined by ICMR. <br/ >5. Patients suffering from active malignancy. <br/ >6. Severe chronic kidney disease or requiring dialysis ( i.e. eGFR <30 mL/min). <br/ >7. Pregnancy and breast-feeding. <br/ >8. Anticipated transfer to another hospital which is not a study site within 72 hours. <br/ >9. Contraindication to any study medication including allergy. <br/ >10. Human immunodeficiency virus infection under highly active antiretroviral therapy ( HAART). <br/ >

1. Patients less than 18 years of age. <br/ >2. Patience who have taken high dose vitamin D (i.e.60,000 IU of Vitamin D) In the last 3months either daily, Weekly or monthly or whose 25 (OH) D level is above 30 ng/ml. <br/ >3. Refusal to participate expressed by patient or legally authorised representative if they are present. Refusal to sign the informed Consent form. <br/ >4. Patients of category 4, 5, 6 ( ARDS, Sepsis, Septic Shock) Respectively as a defined by ICMR. <br/ >5. Patients suffering from active malignancy. <br/ >6. Severe chronic kidney disease or requiring dialysis ( i.e. eGFR <30 mL/min). <br/ >7. Pregnancy and breast-feeding. <br/ >8. Anticipated transfer to another hospital which is not a study site within 72 hours. <br/ >9. Contraindication to any study medication including allergy. <br/ >10. Human immunodeficiency virus infection under highly active antiretroviral therapy ( HAART). <br/ >

N/A

N/A

1. Patients less than 18 years of age. <br/ >2. Patience who have taken high dose vitamin D (i.e.60,000 IU of Vitamin D) In the last 3months either daily, Weekly or monthly or whose 25 (OH) D level is above 30 ng/ml. <br/ >3. Refusal to participate expressed by patient or legally authorised representative if they are present. Refusal to sign the informed Consent form. <br/ >4. Patients of category 4, 5, 6 ( ARDS, Sepsis, Septic Shock) Respectively as a defined by ICMR. <br/ >5. Patients suffering from active malignancy. <br/ >6. Severe chronic kidney disease or requiring dialysis ( i.e. eGFR <30 mL/min). <br/ >7. Pregnancy and breast-feeding. <br/ >8. Anticipated transfer to another hospital which is not a study site within 72 hours. <br/ >9. Contraindication to any study medication including allergy. <br/ >10. Human immunodeficiency virus infection under highly active antiretroviral therapy ( HAART). <br/ >

1. Patients less than 18 years of age. <br/ >2. Patience who have taken high dose vitamin D (i.e.60,000 IU of Vitamin D) In the last 3months either daily, Weekly or monthly or whose 25 (OH) D level is above 30 ng/ml. <br/ >3. Refusal to participate expressed by patient or legally authorised representative if they are present. Refusal to sign the informed Consent form. <br/ >4. Patients of category 4, 5, 6 ( ARDS, Sepsis, Septic Shock) Respectively as a defined by ICMR. <br/ >5. Patients suffering from active malignancy. <br/ >6. Severe chronic kidney disease or requiring dialysis ( i.e. eGFR <30 mL/min). <br/ >7. Pregnancy and breast-feeding. <br/ >8. Anticipated transfer to another hospital which is not a study site within 72 hours. <br/ >9. Contraindication to any study medication including allergy. <br/ >10. Human immunodeficiency virus infection under highly active antiretroviral therapy ( HAART). <br/ >