1. Participants of either sex, 20 to 60 years of age who are at high risk. High-risk individuals are defined as all health care professionals in hospitals, clinics, and emergency rooms, and medical facilities involved in management of COVID -19 patients. <br/ >(Doctors, nursing staff, paramedical staff, ambulance staff, other hospital staff, ward attendees coming in contact with COVID -19 patients). <br/ >2. Participants who are negative for RT-PCR test for COVID-19 infection <br/ >3. Participants who are willing to provide inform consent and willing to come for schedule follow up visit. <br/ >4. Participant not having contra indication to take Vitamin D, <br/ >5. Participants having no COVID- 19 infection clinically. <br/ >6. Signed informed consent, demonstrating that the subject understands the procedures required for the study and the purpose of the study. <br/ >

1. Participants of either sex, 20 to 60 years of age who are at high risk. High-risk individuals are defined as all health care professionals in hospitals, clinics, and emergency rooms, and medical facilities involved in management of COVID -19 patients. <br/ >(Doctors, nursing staff, paramedical staff, ambulance staff, other hospital staff, ward attendees coming in contact with COVID -19 patients). <br/ >2. Participants who are negative for RT-PCR test for COVID-19 infection <br/ >3. Participants who are willing to provide inform consent and willing to come for schedule follow up visit. <br/ >4. Participant not having contra indication to take Vitamin D, <br/ >5. Participants having no COVID- 19 infection clinically. <br/ >6. Signed informed consent, demonstrating that the subject understands the procedures required for the study and the purpose of the study. <br/ >

1. Participants of either sex, 20 to 60 years of age who are at high risk. High-risk individuals are defined as all health care professionals in hospitals, clinics, and emergency rooms, and medical facilities involved in management of COVID -19 patients. <br/ >(Doctors, nursing staff, paramedical staff, ambulance staff, other hospital staff, ward attendees coming in contact with COVID -19 patients). <br/ >2. Participants who are negative for RT-PCR test for COVID-19 infection <br/ >3. Participants who are willing to provide inform consent and willing to come for schedule follow up visit. <br/ >4. Participant not having contra indication to take Vitamin D, <br/ >5. Participants having no COVID- 19 infection clinically. <br/ >6. Signed informed consent, demonstrating that the subject understands the procedures required for the study and the purpose of the study. <br/ >

1. Participants of either sex, 20 to 60 years of age who are at high risk. High-risk individuals are defined as all health care professionals in hospitals, clinics, and emergency rooms, and medical facilities involved in management of COVID -19 patients. <br/ >(Doctors, nursing staff, paramedical staff, ambulance staff, other hospital staff, ward attendees coming in contact with COVID -19 patients). <br/ >2. Participants who are negative for RT-PCR test for COVID-19 infection <br/ >3. Participants who are willing to provide inform consent and willing to come for schedule follow up visit. <br/ >4. Participant not having contra indication to take Vitamin D, <br/ >5. Participants having no COVID- 19 infection clinically. <br/ >6. Signed informed consent, demonstrating that the subject understands the procedures required for the study and the purpose of the study. <br/ >